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• The Server Fault Wiki of recommended practices [migrated]

  - by Avery Payne

  So I've noticed that there are several recommendations on basic practices on Server Fault, but there doesn't seem to be a cohesive view as to how those recommendations would all fit together. So I thought I would lump these together as a kind of mental exercise to see what the "ServerFault Community IT Department" would look like if it were implemented. This would give a few things: it would make a reasonable wiki (in the true wiki spirit of many contributions), it would provide several links to well-vetted practices, and it would be kind of fun to see what the amalgamation would look like. And who knows, it may even point out some interesting issues between different forms of "best practices", although I would be stunned if there was a conflict hidden in there someplace... Add your favorites from Server Fault as answers, and I'll re-edit this section with the results. Here's a few catagories to collect different ideas together. Hardware Configuration(s) Server room configuration. Server room temperature Firmware Updates and Scheduling Storage Configuration(s) Selecting a NAS box Linux: Dealing with /tmp Linux: Install apps in /var or /opt? Network Configuration(s) checking DNS health and compliance Security Practice(s) Password (General) Best Practices Password sharing methods Windows Update Updating Windows Servers that are hosts for VMs Network Service(s) User Service(s) User Naming & Deletion Upgrade Process(es) Disaster Recovery Checking Backups Documenting an outage for a post-mortem review Last Edit: 2010-02-17

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• Can't install MailParse on cpanel server

  - by Tom

  Hi, I've got a linux vps running CentOs 5.5 (cpanel/whm), I've installed MailParse via Module Installers section on whm, and it did install it, the end of setup log: running: make INSTALL_ROOT="/root/tmp/pear-build-root/install-mailparse-2.1.5" install Installing shared extensions: /root/tmp/pear-build-root/install-mailparse-2.1.5/usr/lib/php/extensions/no-debug-non-zts-20090626/ running: find "/root/tmp/pear-build-root/install-mailparse-2.1.5" | xargs ls -dils 508718 4 drwxr-xr-x 3 root root 4096 Feb 6 21:08 /root/tmp/pear-build-root/install-mailparse-2.1.5 508745 4 drwxr-xr-x 3 root root 4096 Feb 6 21:08 /root/tmp/pear-build-root/install-mailparse-2.1.5/usr 508746 4 drwxr-xr-x 3 root root 4096 Feb 6 21:08 /root/tmp/pear-build-root/install-mailparse-2.1.5/usr/lib 508747 4 drwxr-xr-x 3 root root 4096 Feb 6 21:08 /root/tmp/pear-build-root/install-mailparse-2.1.5/usr/lib/php 508748 4 drwxr-xr-x 3 root root 4096 Feb 6 21:08 /root/tmp/pear-build-root/install-mailparse-2.1.5/usr/lib/php/extensions 508749 4 drwxr-xr-x 2 root root 4096 Feb 6 21:08 /root/tmp/pear-build-root/install-mailparse-2.1.5/usr/lib/php/extensions/no-debug-non-zts-20090626 508744 196 -rwxr-xr-x 1 root root 193502 Feb 6 21:08 /root/tmp/pear-build-root/install-mailparse-2.1.5/usr/lib/php/extensions/no-debug-non-zts-20090626/mailparse.so Build process completed successfully Installing '/usr/lib/php/extensions/no-debug-non-zts-20090626/mailparse.so' install ok: channel://pecl.php.net/mailparse-2.1.5 Extension mailparse enabled in php.ini The mailparse.so object is not in /usr/local/lib/php/extensions/no-debug-non-zts-20090626 Now, when i try to use mailparse functions using php i get the following error: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20090626/mailparse.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20090626/mailparse.so: cannot open shared object file: No such file or directory in Unknown on line 0 What should i do?

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• Typical outbound port list for guest access?

  - by Steve

  I manage a weekly rental house that includes wireless Internet access. I've allowed all outbound ports on my router but my ISP has disabled my Internet access twice now because guests have downloaded (or served up) copyrighted content. So I'd like to institute some port filtering to discourage p2p sharing (see disclaimer below). But I don't want to inconvenience the 99.9% of folks who keep things above-board. My question is, what outbound ports are typically open for rental/hotel wireless Internet access, or where can I find such a list? TCP 80,443,25,110 at a minimum. Though my own email service uses 995 and 465 for SSL, some may use IMAP, I personally use SSH and FTP, so I'll open those. Roughly I figure I need to open access to privileged ports, and close 1024 & above. Is there a whitelist I should institute for commonly used high ports? And does it make sense to block UDP 1024 ? Disclaimer: I realize anyone replying to this message could circumvent the port filtering and share content to their heart's content. I do not need comprehensive p2p blocking, which requires more than a port whitelist. Anyone staying at the house shoulders the responsibility for their Internet use, per the rental contract. Also anyone savvy enough to circumvent the port filters would hopefully be savvy enough to use some sort of peer blocking, thereby preventing the ISP from taking down the service.

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• Windows 7, network shares, and authentication via local group instead of local user

  - by Donovan

  I have been doing some troubleshooting of my home network lately and have come to an odd conclusion that I was hoping to get some clarification on. I'm used to managing share permissions in a domain environment via groups instead of individual user accounts. I have a box at home running windows 7 ultimate and I decided to share some directories on that machine. I set it up to disallow guest access and require specifically granted permissions. (password moe?). Anyway, after a whole bunch of time i figured out that even though the shares I created were allowed via a local group i could not access them until i gave specific allowance to the intended user. I just didn't think i would have to do that. So here is the breakdown. Network is windows workgroup, not homegroup or nt domain PC_1 - win 7 ultimate - sharing in classic mode - user BOB - groups Admins PC_2 - win 7 starter - client - user BOB - groups admins PC_3 - win xp pro - client - user BOB - groups admins the share on PC_1 granted permission to only the local group administrators. local user BOB on PC_1 was a member of administrators. Both PC_2 and PC_3 could not browse the intended share on PC_1 because they were denied access. Also, no challenge was presented. They were simply denied. After adding BOB specifically to the intended share everything works just fine. Remember, its not an nt domain just a workgroup. But still, shouldn't i be able to manage share permissions via groups instead of individual user accounts? D.

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• calculate AUC (GAM) in R [migrated]

  - by ahmad

  I used the following script to calculate AUC in R: library(mgcv) library(ROCR) library(AUC) data1=read.table("d:\\2005.txt", header=T) GAM<-gam(tuna ~ s(chla)+s(sst)+s(ssha),family=binomial, data=data1) gampred<- predict(GAM, type="response") rp <- prediction(gampred, data1$tuna) auc <- performance( rp, "auc")@y.values[[1]] auc roc <- performance( rp, "tpr", "fpr") plot( roc ) But when I was running the script, the result is: **rp <- prediction(gampred, data1$tuna) Error in prediction(gampred, data1$tuna) : Format of predictions is invalid. > > auc <- performance( rp, "auc")@y.values[[1]] Error in performance(rp, "auc") : object 'rp' not found > auc function (x, min = 0, max = 1) { if (any(class(x) == "roc")) { if (min != 0 || max != 1) { x$fpr <- x$fpr[x$cutoffs >= min & x$cutoffs <= max] x$tpr <- x$tpr[x$cutoffs >= min & x$cutoffs <= max] } ans <- 0 for (i in 2:length(x$fpr)) { ans <- ans + 0.5 * abs(x$fpr[i] - x$fpr[i - 1]) * (x$tpr[i] + x$tpr[i - 1]) } } else if (any(class(x) %in% c("accuracy", "sensitivity", "specificity"))) { if (min != 0 || max != 1) { x$cutoffs <- x$cutoffs[x$cutoffs >= min & x$cutoffs <= max] x$measure <- x$measure[x$cutoffs >= min & x$cutoffs <= max] } ans <- 0 for (i in 2:(length(x$cutoffs))) { ans <- ans + 0.5 * abs(x$cutoffs[i - 1] - x$cutoffs[i]) * (x$measure[i] + x$measure[i - 1]) } } return(as.numeric(ans)) } <bytecode: 0x03012f10> <environment: namespace:AUC> > > roc <- performance( rp, "tpr", "fpr") Error in performance(rp, "tpr", "fpr") : object 'rp' not found > plot( roc ) Error in levels(labels) : argument "labels" is missing, with no default** Can anybody help me to solve this problem? Thank you in advance.

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• vmdk Recovery after migration from 3.5 to 4 and fallback tentative.

  - by olgirard

  Hy, I've tryed to migrate some VM from my 3.5i environment to a brand new vSphere 4.0 U1. The two platforms are running simultaneously, sharing the same SAN. I Migrate my VM by stopping it, unregistering in vcenter (esx ver. 3.5, i call it esx3), register in vSphere (esx ver. 4, i call it esx4), and migrate upgrade virtual hardware before powering it up (First mistake). vMotion was enabled on esx4, seem to be a second mistake. After a day or so, i encountred problems joigning the esx server (esx4) and decided to unregister my server for esx4 and fallback to esx3. esx3 refused to boot, i supposed this was due to virtual hardware in Version 7 so i recreated a new VM pointing to the vmdk of the old VM. Everithing seemed fine until i log into the server and discover that i was running on the original disk ith every snapshots ignored even those created on esx3. I tried to reboot VM on esx4 but VM doesn't power up because "The parent virtual disk has been modified since the child was created". I've got a copy of a later state of the drive but generated between two snapshots (ovf generated with canverter standalone) as a backup. Do i have a chance to recover at least some files on the virtual drive or (as i tink) all is played, i've done enought mistakes for this time. Thanks for your help.

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• Debootstrap Ubuntu over NFS leads to mknod I/O error

  - by Aaron B. Russell

  Hi everyone, I'm trying to prepare an Ubuntu environment for a diskless machine that will PXE boot and mount an NFS share as it's root. I've currently got another Ubuntu machine mounting the NFS share and I'm trying to debootstrap into it, but it has trouble creating devices over NFS: root@kimiko:~# mount | grep Seiuchi 192.168.0.203:/mnt/user/Seiuchi on /mnt type nfs (rw,addr=192.168.0.203) root@kimiko:~# debootstrap --arch i386 maverick /mnt http://gb.archive.ubuntu.com/ubuntu/ mknod: `/mnt/test-dev-null': Input/output error E: Cannot install into target '/mnt' mounted with noexec or nodev My NFS rule on the unRAID server is 192.168.0.201/32(rw,no_root_squash,sync). I don't have the noexec or nodev options set. I've not got much experience with NFS, so I'm probably missing something basic in the way I'm sharing this, but my attempts at Googling for an answer isn't really turning anything useful up. Does anyone have suggestions on what I might have missed or maybe relevant docs? Edit: Creating normal files (and directories) works just fine, I just can't create devices... root@kimiko:/mnt# mkdir foo root@kimiko:/mnt# cd foo root@kimiko:/mnt/foo# touch bar root@kimiko:/mnt/foo# mknod quux c 4 64 mknod: `quux': Input/output error root@kimiko:/mnt/foo# ls bar

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• how to prevent other computers from seeing our network computers through vpn

  - by Disco

  We have a local office domain consisting of Windows 7 and XP machines that is running on Windows Server 2008 R2. We also have users that connect via VPN into our network. My concern is that when a remote user opens up a folder, the Network section on the left side of the folder shows the remote user all the computer names in our local network. I would like to go about renaming our computers in the local network with more descriptive computer names, but I do not want the users off-site to be able to see these computer names by simply opening up a folder. (Granted, they can already do this, but our current naming scheme does not link computer names to users.) I would like to change our computer names so we can determine which computer belongs to which user more easily IF it can be done securely. How can I ensure that our local computer names are not showing up in the Network folder for remote, VPN-connected users? My online searches have turned up results where people are advised to turn off Network Sharing and Discovery, but that seems to only ensure that the local machine doesn't see other computer names. I want to prevent OUR computer names from showing up on OTHER computers, and I can't go into the VPN-connected computers and turn off THEIR Network Discovery settings. I would think there is a group policy that would control this but I have not found one yet and I don't know how I would apply it to VPN-connected computers. Thanks! EDIT: That's true, a Group Policy wouldn't run on users only connecting via VPN, good point. What about a VPN/router policy, then?

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• Cannot find network path for computer in workgroup of home Windows XP PCs

  - by John Galt

  VMWare Workstation 6.5 is running as an app on a Windows Vista 64bit PC host. Thanks to Workstation we have 2 guest machines running: TerriVM and MattVM (both of these run Windows XP SP2). We are attempting to get virtual networking configured so we can access the files of both of these VM guest systems from other real PCs connected to this home network. We think we are close but we can't quite get it right... Here is what we've done so far: * On VM Workstation, we set "Host Virtual Network Mapping" to use VMnet0 with the setting "Bridge to an automatically chosen adapter". * On each VM guest (i.e. using Windows explorer on XP), we rightmouse on the C disk, click "Sharing" tab, set shareName to "C_Disk" and check both boxes labeled "Share this folder on the network" and "Allow network users to change my files". Symptoms: On "JohnsRealXP" PC, we go to Windows Explorer, My Computer, Map Network Drive, type into Folder textbox: \TerriVM\C_Disk and assign drive letter T. We see all the folders on this shared drive and can open files on them. So that is good. On same "JohnsRealXP" PC, we go to Windows Explorer, My Computer, Map Network Drive, type into Folder textbox: \MattVM\C_Disk and assign drive letter M. We get a message box "_The network path \mattvm\C_Disk could not be found_". Alternatively, we type just \mattvm\ into the Folder box and click "Browse" and get a dialog box where we drill down from "Entire Network" to "Microsoft Windows Network" to "Workgroup" where both TerriVM and MattVM are listed as computers on the network. Clicking the + sign next to MattVM gives an hourglass and never enables the OK button and I have to cancel. In summary, I think we've attempted to share both of these virtual machines using the same techniques and connect to them in similar fashion, but one connects properly and the other machine can be seen but no shared resources on it can be accessed. Can anyone suggest something possibly overlooked or something to try? Thanks so much in advance.

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• cannot connect to <server_name>\sqlexpress

  - by Jackson Sunuwar

  I have tried disabling firing wall and checked sqlbrowser is started but for some reason I cannnot connect to my datbase... called server_name\sqlexpress.. I have a virtual machine and a full scale MS SQL Server 2008 R2 running on it... and I have several other vm running sqlexpress. they run fine and I can connect to them using sqlexpress... but when i try to access from sqlserver... I get this error. A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1) Digging deep into the error, I found this Error Number: -1 Severity: 20 State: 0 and finally this... Program Location: at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.SqlServer.Management.SqlStudio.Explorer.ObjectExplorerService.ValidateConnection(UIConnectionInfo ci, IServerType server) at Microsoft.SqlServer.Management.UI.ConnectionDlg.Connector.ConnectionThreadUser() Firewall is turned off on the VM that's running mssqlserver... I turned of firewall on one of the vm that's running the sqlexpress but I still get the error... can someone please help... thank you

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• Epson Artisan 800 on Ubuntu/Linux

  - by Tim Lytle

  Update for Ubuntu 10.04: Printing should work 'out-of-box', scanning still needs the newer sane backend. Looking for a known good way to setup an Epson Artisan 800 on Ubuntu specifically or any linux box in general. It is a printer/scanner with ethernet/wifi/usb. I'd like to use it as a network printer/scanner being able to do both from my Windows and Ubuntu machines; however, if it needs to be physically connected to a computer (preferably the Ubuntu machine) that is doable (again, then sharing print/scan functions to the network). Basically, I'm looking for someone who has used this printer/scanner (or similar) in a multi-platform environment to share how the set it up and how well it worked. Updated: A little more information, like most printers (I expect) the documentation for the printer basically says, "don't use plug-n-play, run our setup CD from your Windows/Mac system", to do anything (set it up for network use even). I guess that's to make it easy for anyone else to setup, but when you're looking to use it with an unsupported (by Epson's documentation) OS, you're just stuck on your own. What I was hoping for was someone who could say, "Forget the bundled software, do [this] to set it up on wifi manually, install [this] to connect to the scanner from [os], printing works with [this] driver - at least that's how I set it up." I'll will (and have so far) use the information here, and post my own setup when I'm done, if there's no one else out there with that experience.

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• Assistance on setup to Connect an offsite server to the LAN via RRAS VPN - Server 2008 R2

  - by Paul D'Ambra

  I have an office LAN protected using a Zyxel Zywall USG 300. I've set up an L2TP/ipsec VPN on that which accepts connections using a shared secret and I've tested this from multiple clients. I have a server offsite and want to set up RRAS to use a persistent connection to the VPN so that it can carry out network jobs even with no one logged in (I'm using it for Micorosft DPM secondary backup). If I create a vpn as if I were setting up a users laptop it can dial in no problem but if I set up a demand dial interface in RRAS it errors. I enable RRAS ticking only demand dial interface (branch office routing) Select network interfaces, right click and choose new demand dial interface Name the VPN ToCompany Select connect using VPN And then L2TP as the vpn type enter the IP address (double-checked for typos!) select Route IP packets on this interface specify static route to remote network as 10.0.0.0/24 with metric of 1 add dial out credentials (again double checked for typos and confirmed with other vpn connections click finish now I right-click on the new interface and choose properties and then the security tab I change Data encryption to optional select only PAP for Authentication (both as per manufacturer of Zywall) click advanced settings against type of vpn and set shared secret then I select the new interface, right-click and choose connect this dials and then errors with either 720 or 811 as the error codes. However, if I create a VPN by going to Network & Sharing center and setting up as if I was creating a VPN from my laptop to the office (say) it dials successfully so I know the VPN settings are correct and the machine can connect to the VPN. Suggests very strongly the problem is how I'm setting up RRAS. Can anyone help?

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• Cannot connect to windows server by name over vpn connection

  - by ErocM

  I have a rented dedicated windows server on a public ip that is acting as a SQL Server and VPN server. I need to connect to this server via computer name to get replication in place. I cannot use an ip address due to this issue: So, due to this, we are going the VPN route. That is my primary issue: After I am connected to this server's vpn, I can connect to SQL Server using the ip address but I cannot connect by the computer's name as you can see below... Right now, there is no hardware firewall on it since I had it removed to test this issue. I am running Windows 2008 Enterprise Server as the VPN server. I am not sure if the route print will help any from the workstation trying to connect but here is the info: IPv4 Route Table Active Routes: Network Destination Netmask Gateway Interface Metric 10.0.0.0 255.0.0.0 10.0.0.1 10.0.0.2 21 10.0.0.2 255.255.255.255 On-link 10.0.0.2 276 Any other info needed? Thanks for the help! ========= CLARIFICATION ON A FEW THINGS #1 ========= This is the server's info: This is the workstation that is trying to connect: I connect to the server via "Control Panel\Network and Internet\Network and Sharing Center\Connect or Disconnect" You can see here that I am connected: ========= CLARIFICATION ON A FEW THINGS #2 ========= I've tried to connect directly to the Sql Server as I did above but with the computers name and I couldn't get to it. Here I am trying to net view it from the workstation and it couldn't find it:

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• Samba between Ubuntu server 10.10 and Windows Vista, Windows 7

  - by chepukha

  I have a linux box running Linux server ubuntu 10.10. I have installed Samba on this linux box and want to share files with my laptops which run Windows Vista home and Windows 7 home. I have been struggling with the setup for almost a month but couldn't get it right. If I try to access share folder from Windows Vista, I get message "Windows cannot access \\server_ip_address". Error code: 0x80070035. The network path was not found. If I access from Windows 7, then after entering password to login I can see the list of share folders on Linux box. But if I click on a share folder, I get the same error message as above. Tail /var/log/samba/log.windows7-pc I got the following message: [2011/03/16 00:17:41.427238, 0] smbd/service.c:988(make_connection_snum) canonicalize_connect_path failed for service sharemedia, path /root/sharemedia Here is my setting in smb.conf [global] share modes = yes netbios name = Samba workgroup = WORKGROUP wins support = yes encrypt passwords = true [sharemedia] comment = Tesing sharing using Samba path=/root/sharemedia/ public = yes valid users = samba_usr_name ; make sure all files are sensible permissions create mask = 0660 force create mask = 0660 directory mask = 2770 force directory mask = 2770 directory security mask = 0000 ; Normal share parameters read only = no browseable = yes writable = yes guest ok = no

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• How to read cell data in excel and output to command prompt

  - by Max Ollerenshaw

  Hi All, I'm a sys admin and I am trying to learn how to use powershell... I have never done any type of scripting or coding before and I have been teaching myself online by learning from the technet script centre and online forums. What I am trying to accomplish is to open an excel spreadsheet get information from it (usernames and password) and then output it into the command prompt in powershell. When ever I try to do this I get an Exception calling "InvokeMember" anyway, here is the code I have so far: function Invoke([object]$m, [string]$method, $parameters) { $m.PSBase.GetType().InvokeMember( $method, [Reflection.BindingFlags]::InvokeMethod, $null, $m, $parameters,$ciUS ) } $ciUS = [System.Globalization.CultureInfo]'en-US' $objExcel = New-Object -comobject Excel.Application $objExcel.Visible = $False $objExcel.DisplayAlerts = $False $objWorkbook = Invoke $objExcel.Workbooks.Open "C:\PS\User Data.xls" Write-Host "Numer of worksheets: " $objWorkbook.Sheets.Count $objWorksheet = $objWorkbook.Worksheets.Item(1) Write-Host "Worksheet: " $objWorksheet.Name $Forename = $objWorksheet.Cells.Item(2,1).Text $Surname = $objWorksheet.Cells.Item(2,2).Text Write-Host "Forename: " $Forename Write-Host "Surname: " $Surname $objExcel.Quit() If (ps excel) { kill -name excel} I have read many different posts on forums and articles on how to try and get around the en-US problem but I cannot seem to get around it and hope that someone here can help! Here is the Exeption problem I mentioned: Exception calling "InvokeMember" with "6" argument(s): "Method 'System.Management.Automation.PSMethod.C:\PS\User Data.x ls' not found." At C:\PS\excel.ps1:3 char:33 + $m.PSBase.GetType().InvokeMember <<<< ( + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : DotNetMethodException Numer of worksheets: You cannot call a method on a null-valued expression. At C:\PS\excel.ps1:18 char:45 + $objWorksheet = $objWorkbook.Worksheets.Item <<<< (1) + CategoryInfo : InvalidOperation: (Item:String) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull Worksheet: You cannot call a method on a null-valued expression. At C:\PS\excel.ps1:21 char:37 + $Forename = $objWorksheet.Cells.Item <<<< (2,1).Text + CategoryInfo : InvalidOperation: (Item:String) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull You cannot call a method on a null-valued expression. At C:\PS\excel.ps1:22 char:36 + $Surname = $objWorksheet.Cells.Item <<<< (2,2).Text + CategoryInfo : InvalidOperation: (Item:String) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull Forename: Surname: This is the first question I have ever asked, try to be nice! :)) Many Thanks Max

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• Choosing the right e-mail client

  - by CFP

  Hi all, I'm currently using Outlook 2007 (under windows 7), but I much prefer free software (open source being the best of course), so I thought I'd ask for expert advice here. I thought it might be easier if I included a small "wanted list": I receive about 15 to 30 e-mails every day, but I have large archives (10'000 emails), which I frequently need to access. I usually open and close my mail program many times, so I'd like it to start pretty fast I cannot use an online mailbox, because I have too many email addresses (about 5: 1 for work, 1 for home, 1 semi-private, 1 for specific emails, and 1 for newletters By order of importance, the things I'd like my mail client to be able to: Efficiently categorize e-mails. Until now, I've mostly been using Outlook folders, because filtering by tags was not easy, but I'd rather one large list of mails, neatly tagged so I can easily filter. I'd love being able to select mails by tags (eg in a click or too (could be a tab) show all mails tagged with "software") Create "tagging rules", such as "if the mail was sent to this address, add this tag", or "if the body contains ..., add that tag" Sync contacts with Gmail, handle tasks (syncing with toodledo would be awesome), possibly provide a calendar Create e-mail templates, signatures... Other ideas: A timeline, scripting support, being able to import MS Outlook emails, provide a nice backup format... Thanks for sharing ideas and suggestions!

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• Cloudfront - How to invalidate objects in a distribution that was transformed from secured to public?

  - by Gil

  The setting I have an Amazon Cloudfront distribution that was originally set as secured. Objects in this distribution required a URL signing. For example, a valid URL used to be of the following format: https://d1stsppuecoabc.cloudfront.net/images/TheImage.jpg?Expires=1413119282&Signature=NLLRTVVmzyTEzhm-ugpRymi~nM2v97vxoZV5K9sCd4d7~PhgWINoTUVBElkWehIWqLMIAq0S2HWU9ak5XIwNN9B57mwWlsuOleB~XBN1A-5kzwLr7pSM5UzGn4zn6GRiH-qb2zEoE2Fz9MnD9Zc5nMoh2XXwawMvWG7EYInK1m~X9LXfDvNaOO5iY7xY4HyIS-Q~xYHWUnt0TgcHJ8cE9xrSiwP1qX3B8lEUtMkvVbyLw__&Key-Pair-Id=APKAI7F5R77FFNFWGABC The distribution points to an S3 bucket that also used to be secured (it only allowed access through the cloudfront). What happened At some point, the URL singing expired and would return a 403. Since we no longer need to keep the same security level, I recently changed the setting of the cloudfront distribution and of the S3 bucket it is pointing to, both to be public. I then tried to invalidate objects in this distribution. Invalidation did not throw any errors, however the invalidation did not seem to succeed. Requests to the same cloudfront URL (with or without the query string) still return 403. The response header looks like: HTTP/1.1 403 Forbidden Server: CloudFront Date: Mon, 18 Aug 2014 15:16:08 GMT Content-Type: text/xml Content-Length: 110 Connection: keep-alive X-Cache: Error from cloudfront Via: 1.1 3abf650c7bf73e47515000bddf3f04a0.cloudfront.net (CloudFront) X-Amz-Cf-Id: j1CszSXz0DO-IxFvHWyqkDSdO462LwkfLY0muRDrULU7zT_W4HuZ2B== Things I tried I tried to set another cloudfront distribution that points to the same S3 as origin server. Requests to the same object in the new distribution were successful. The question Did anyone encounter the same situation where a cloudfront URL that returns 403 cannot be invalidated? Is there any reason why wouldn't the object get invalidated? Thanks for your help!

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• One-To-Many Powershell Scripts

  - by Matt

  I'm trying to create a script to run as a scheduled task, which will run against multiple servers and retrieve some information. To start with, I populate the list of servers by querying AD for all servers that match a certain set of criteria, using Get-ADComputer. The problem is, the list is returned as an object, which I can't then pass to the New-PSSession list. I have tried converting it to a comma-seperated string by doing the following: foreach ($server in $serverlist) {$newlist += $server.Name + ","} but this still doesn't work. the alternative is to iterate through the list and run the various commands against each server one at a time, but my preference would be to avoid this and run them using one-to-many remoting. UPDATE: To clarify what I want to end up being able to do is using -ComputerName $serverlist, so I want $serverlist to be a string rather than an object. UPDATE 2: Thanks for all the suggestions. Between them and my original method I'm starting to wonder whether -ComputerName can accept a string variable? I've got varying degrees of success getting the list of computers converted to a comma separated string, but no matter how I do it I always get invalid network address.

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• How to connect a USB GDI printer to Linux over a D-Link print server?

  - by jpe

  The setup is the following: +------------+ +-----------------+ +---------+ | HP LJ P1005|--USB--| D-Link DPR-1020 |---LAN---| PC Linux| +------------+ +-----------------+ + +---------+ | +------------+ +--| PC Windows | +------------+ HP LJ P1005 is one of those GDI printers that requires the printer driver to do most of the work for it and therefore is a bit "special". D-Link DPR-1020 is a print server with an Ethernet and an USB port that actually supports printing to challenged (read GDI) printers using a utility called PS-Link. What the utility does is basically mirror a USB port over the network to the print server so that the printer driver and the printer both are happy to talk to each other. The PC-s are notebooks that come and go, i.e. are not there all the time. Is there an equivalent of the D-Link PS-Link utility for Linux that could mirror a USB port over the network for a Linux host? And can the solution be used with D-Link DPR-1020? If not then I basically wasted the money buying the print server because the goal was to share a small printer among a couple of users with diverse operating systems in an office. The print server specs say that it supports Linux and LJ P1005, but the Catch 22 appears to be the solution used for GDI printers... It should be noted that it is possible to print from Linux to LJ P1005 directly over USB. This far sharing involved reconnecting the USB cable to appropriate computer to print. Now one of the desks is separated, so the cable does not work. Searching the net did not yield anything useful. Please do not suggest solutions involving a Windows machine (either virtual or not), my question is whether a solution only involving a Linux machine exists.

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• How to link to a subfolder of a share?

  - by Nicolas Raoul

  On my Windows XP server, a folder called Share2 is shared. It contains a subfolder called folder3. The guest account is protected by a password, which means network users have to type the guest password to access it. When a user types \\server\Share2 in his file explorer, he is prompted for a password. When a user types \\server\Share2\folder3 in his file explorer, an error appears. He is not even prompted for a password. This is problematic because I want to link to this particular folder. How can I link to folder3? Notes: - Both Desktop shortcuts and HTML links in IE7/8 give an error if I link to folder3, but work if I just link to Share2. - Using the file:// syntax instead of the \\ syntax leads to the same results. - Password setting per http://www.lancelhoff.com/how-to-password-protect-a-shared-folder - Not using "Simple File Sharing" - The error message is ???????????????????????? which means "could not find it. check the path and try again". No English Windows around to try, sorry! It is easy to reproduce the problem though, so can anyone post the English error message for the sake of searchability? Thanks!

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• Networking 2 Virtual PC with one VPC as DHCP server

  - by vivek

  My host OS is Win XP Professional. The host has a real network connection via DSL and I created a second network connection using Microsoft Loopback Adapter. Internet connection sharing is enabled. The Microsoft Loopback adapter has a IP address of 192.168.0.1. I have 1 Virtual PC which has Windows Server 2003. I have setup the network connection on this VPC to use Microsoft Loopback Adapter. I setup this VPC to be the Domain Controller , DNS Server and DHCP Server. I set this to a static IP address 192.168.0.2 (on the same subnet as the MS Loopback adapter) I have a second Virtual PC which also has Windows Server 2003. The network connection on this VPC is set to "Local Only". I want this VPC to get its IP address from the 1st VPC on which I setup as a DHCP server. What i want is the 2 VPC should be in a network with one of the VPC acting as the domain controller, DNS Server and DHCP server. The second VPC shoud get its IP address from the 1st VPC. It should be a part of the domain of the 1st VPC. When i tried to make the second VPC get the IP address from the first VPC I am not succeeding. Can somebody post some suggestions on how to go about this ?

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• How to move your Windows User Profile to another drive in Windows 8

  - by Mark

  I like to have my user folder on a different drive (D:) than my OS is (C:). Reading the following post I decided to give it a try. All went quite well, untill I found out that my Windows 8 Apps won't execute anymore (other than that I didn't noticed any problems). My apps do work, while using an account that isn't moved. In the eventviewer I've found error messages like these: App <Microsoft.MicrosoftSkyDrive> crashed with an unhandled Javascript exception. App details are as follows: Display Name:<SkyDrive>, AppUserModelId: <microsoft.microsoftskydrive_8wekyb3d8bbwe!Microsoft.MicrosoftSkyDrive> Package Identity:<microsoft.microsoftskydrive_16.4.4204.712_x64__8wekyb3d8bbwe> PID:<4452>. The details of the JavaScript exception are as follows Exception Name:<WinRT error>, Description:<Loading the state store failed. > , HTML Document Path:</modernskydrive/product/skydrive/App.html>, Source File Name:<ms-appx://microsoft.microsoftskydrive/jx/jx.js>, Source Line Number:<1>, Source Column Number:<27246>, and Stack Trace: ms-appx://microsoft.microsoftskydrive/jx/jx.js:1:27246 localSettings() ms-appx://microsoft.microsoftskydrive/jx/jx.js:1:51544 _initSettings() ms-appx://microsoft.microsoftskydrive/jx/jx.js:1:54710 getApplicationStatus(boolean) ms-appx://microsoft.microsoftskydrive/jx/jx.js:1:48180 init(object) ms-appx://microsoft.microsoftskydrive/jx/jx.js:1:45583 Application(number, boolean) ms-appx://microsoft.microsoftskydrive/modernskydrive/product/skydrive/App.html:216:13 Anonymous function(object) Using ProcMon, I see a lot of access denied messages, like these: Date & Time: 12-9-2012 9:32:20 Event Class: File System Operation: CreateFile Result: ACCESS DENIED Path: D:\Users\John\AppData\Local\Packages\microsoft.microsoftskydrive_8wekyb3d8bbwe\Settings\settings.dat TID: 2520 Duration: 0.0000149 Desired Access: Read Data/List Directory, Write Data/Add File, Read Control Disposition: OpenIf Options: Sequential Access, Synchronous IO Non-Alert, No Compression Attributes: N ShareMode: None AllocationSize: 0 Any idea how to solve this? I noticed that the app folders e.g.: D:\Users\john\AppData\Local\Packages\microsoft.microsoftskydrive_8wekyb3d8bbwe had a different owner than the old profile folder had. Old profile folder had john as owner where my new profile folder had the Administrators group as owner. Changing this didn't help unfortunately.

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• When should NTPd broadcast/broadcastclient be used instead of client/server or peer modes?

  - by Luke404

  The NTP deamon if often used in its simplest mode, which is client/server: you specify one or more server directives in your ntp.conf and your clients will use those servers. In addition to that, when you run your own NTP servers, it is good practice to peer them together, so if one of them looses connectivity to its upstream servers, it will get time from its peers. But NTPd can also work with broadcast and/or multicast distribution of time data, with the documentation stating: broadcast and multicast modes are intended for configurations involving one or a few servers and a possibly very large client population The documentation also says elsewhere: It is possible and frequently useful to configure a host as both broadcast client and broadcast server. A number of hosts configured this way and sharing a common broadcast address will automatically organize themselves in an optimum configuration based on stratum and synchronization distance. I can see one obvious administrative benefit: you don't have to manually specify and update your list of NTP servers in the clients ntp.conf, so to me it looks tempting to use broadcast mode even for a small client population (say 5+ clients with 3~4 servers). I expect network traffic to be a little higher with broadcasts instead of client/server associations, but given the usual gigabit ethernet LAN the impact should be negligible unless you have a very very large number of hosts in the same broadcast domain. At the end of the day, when should broadcast mode be used or avoided? Are there pros and cons I haven't seen?

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• Using the same Windows 8 Upgrade installer on multiple PCs

  - by Karan

  As per this article: You may transfer the software to another computer that belongs to you. … You may not transfer the software to share licenses between computers. But what if I have a bunch of PCs with a mix of XP/Vista/Windows 7? Can I purchase either the Windows 8 Pro Upgrade $40 (download only) or $70 (DVD) version (both of which come without a key) only once and use it to upgrade all the PCs? Since I'm not sharing the license and each PC has its own valid genuine license, it should be allowed, right, or is it illegal? Even if they want people to shell out $40/$70 for each PC, how would they enforce the use of the installer/media on only one PC each? EDIT: I have been given to believe by a source that the installer will only check for the previous OS' key, which is what is confusing me (I have never purchased an upgrade version before this, only full retail or pre-installed versions). Is this true or will I need to enter two keys to make the upgrade work, one for the previous version and then one for Windows 8? If the latter is the case, then the issue is solved since obviously the same Windows 8 key will not be valid for multiple PCs.

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• Windows 7 can't see wireless printer

  - by Chance Robertson

  I have a P1102W printer from HP. I have a Windows 7 machine. I have a MacBook Pro. I setup the printer following the instructions from the Windows 7 machine. I am able to print from the Mac but not the Windows 7 machine. And to add, I am not able to print from any Windows 7 machines. The MacBook Pro address is 198.168.2.115, the Windows machine is 192.168.2.117, and the printer in 192.168.2.140. I can ping the printer from the Mac. I can ping the Windows 7 machine from the mac. I can ping the mac from the windows 7 machine. When I try to ping the printer from the Windows 7 machine I get destination unreachable. I can browse to the printer IP address from the mac and not the Windows 7. I have turned off the firewall on the Windows 7 machine and turned on network sharing. Is there something else I am missing. I can connect the printer with a USB cable to the Windows machine and print. I can not get the Windows machine to see the printer even though they are on the same network.

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