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• Windows 7 boots to black screen with blinking cursor

  - by murgatroid99

  I have an Alienware M17x that dual boots into Ubuntu 11.04 and Windows 7 Home Premium. Currently, the computer starts at the GRUB loader and will boot into Ubuntu, but if I try to boot into Windows, I immediately get a black screen with a blinking cursor in the upper left corner. The output of fdisk -l is Device Boot Start End Blocks Id System /dev/dm-0p1 1 5 40131 de Dell Utility Partition 1 does not start on physical sector boundary. /dev/dm-0p2 6 1918 15360000 7 HPFS/NTFS Partition 2 does not start on physical sector boundary. /dev/dm-0p3 * 1918 64772 504878877+ 7 HPFS/NTFS Partition 3 does not start on physical sector boundary. /dev/dm-0p4 64772 77827 104858625 5 Extended Partition 4 does not start on physical sector boundary. /dev/dm-0p5 64772 67204 19531008 83 Linux /dev/dm-0p6 67204 74498 58593536 83 Linux /dev/dm-0p7 74498 77577 24731648 83 Linux /dev/dm-0p8 77578 77827 2000128 82 Linux swap / Solaris I have used the Windows rescue CD, and run the automatic error fixer until it finds no errors. I have run chkdsk /R on both the main Windows 7 (/dev/dm-0p3) partition and the recovery partition (/dev/dm-0p2). I set the main Windows 7 partition to be active. I also tried running in the recovery console the commands bootrec /fixmbr bootrec /fixboot bootrec /rebuildbcd None of these helped and the last set of commands deletes grub, which I then have to reinstall from Ubuntu. I think the last thing I did in windows before this started was install the newest ATI driver for my video card. This would suggest using system restore, and I actually had a restore point earlier (after the problem started), but after whatever I did that restore point does not appear in the list on the recovery disk any more, so I cannot do a system restore. Is there anything else I can try to make Windows boot properly again? Edit: Running the suggested commands bootsect /nt60 c: bcdboot c:\windows /s c: was also ineffective.

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• Virtual Machine Network Architecture, Isolating Public and Private Networks

  - by Mark

  I'm looking for some insight into best practices for network traffic isolation within a virtual environment, specifically under VMWARE ESXi. Currently I have (in testing) 1 hardware server running ESXi but i expect to expand this to multiple pieces of hardware. The current setup is as follows: 1 pfsense VM, this VM accepts all outside (WAN/internet) traffic and performs firewall/port forwarding/NAT functionality. I have multiple public IP addresses sent to the this VM that are used for access to individual servers (via per incoming IP port forwarding rules). This VM is attached to the private (virtual) network that all other VMs are on. It also manages a VPN link into the private network with some access restrictions. This isn't the perimeter firewall but rather the firewall for this virtual pool only. I have 3 VMs that communicate with each other, as well as have some public access requirements: 1 LAMP server running an eCommerce site, public internet accessible 1 accounting server, access via windows server 2008 RDS services for remote access by users 1 inventory/warehouse management server, VPN to client terminals in warehouses These servers constantly talk with each other for data synchronization. Currently all the servers are on the same subnet/virtual network and connected to the internet through the pfsense VM. The pfsense firewall uses port forwarding and NAT to allow outside access to the servers for services and for server access to the internet. My main question is this: Is there a security benefit to adding a second virtual network adapter to each server and controlling traffic such that all server to server communication is on one separate virtual network, while any access to the outside world is routed through the other network adapter, through the firewall, and on the the internet. This is the type of architecture i would use if these were all physical servers, but i'm unsure if the networks being virtual changes the way i should approach locking down this system. Thank you for any thoughts or direction to any appropriate literature.

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• Registry remotley hacked win 7 need help tracking the perp

  - by user577229

  I was writing some .VBS code at thhe office that would allow certain file extensions to be downloaded without a warning dialog on a w7x32 system. The system I was writing this on is in a lab on a segmented subnet. All web access is via a proxy server. The only means of accessing my machine is via the internet or from within the labs MSFT AD domain. While writing and testing my code I found a message of sorts. Upon refresing the registry to verify my code changed a dword, instead the message HELLO was written and visible in regedit where the dword value wass called for. I took a screen shot and proceeded to edit my code. This same weird behavior occurred last time I was writing registry code except on another internal server. I understand that remote registry access exists for windows systems. I will block this immediately once I return to the office. What I want to know is, can I trace who made this connection? How would I do this? I suspect the cause of this is the cause of other "odd" behaviors I'm experiencing at work such as losing control of my input director master control for over an hour and unchanged code that all of a sudden fails for no logical region. These failures occur at funny times, whenver I'm about to give a demonstration of my test code. I know this sounds crazy however knowledge of the registry component makes this believable. Once the registry can be accessed, the entire system is compromised. Any help or sanity checking is appreciated.

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• How to install Windows with no CD drive boot option in BIOS?

  - by Kris Hollenbeck

  I have a new computer which I built from scratch and I am trying to install a copy of Windows Vista on it. I am able to get to the BIOS and change the boot options which are as follows.. -Built-in EFI Shell -SATA: ST31000528AS I have searched around for and everything I find says to boot from the CD rom. However, as you can see. That is not an option for me. So I am wondering if there is another way around this? Is it possible to boot the Disk from the EFI Shell? Any help is much appreciated. Thanks EDIT: I have tried this.. http://technet.microsoft.com/en-us/library/dd744321%28v=ws.10%29.aspx UPDATE: I managed to make my USB bootable via the BIOS and I have copied my windows Vista disk onto my USB via drag and drop. However I am still not able to get the windows install to start. Also I have tried booting it from the EFI shell using the following command.. blk6: blk6:\> \EFI\BOOT\BOOTX64.EFI Still no luck..

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• PEAP validating a secondary domain suffix

  - by sam

  Probably the title is a little bit confusing, let me explain the situation. Our company wants to implement a corporate wireless lan with PEAP authentication. unfortunately someone made a big mistake in our AD design 10 years ago. The domain name we are using "company.ch" is not owned by company but by someone else. so it is not possible to issue a public SSL certificate for the RADIUS server. Our AD is to big to rename it. We already thought about using our private PKI and rollout the CA certificate via GPO but that would only cover our corporate managed clients but not the BYOD (Smartphones, Tablets, Laptops..) Is there a way to add a secondary domain name like “company2.ch” and issue a public certificate and join that radius to that secondary domain aslwell, and configure that secondary dns suffix via DHCP for all the client pools... or is there another way with for example a new radius server which has his own domain company2.ch which is connected with some kind of trust between the company.ch doamin? sorry i'am not a client server guy.. hopefully you get my drift.!?

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• Diagnosing Logon Audit Failure event log entries

  - by Scott Mitchell

  I help a client manage a website that is run on a dedicated web server at a hosting company. Recently, we noticed that over the last two weeks there have been tens of thousands of Audit Failure entries in the Security Event Log with Task Category of Logon - these have been coming in about every two seconds, but interesting stopped altogether as of two days ago. In general, the event description looks like the following: An account failed to log on. Subject: Security ID: SYSTEM Account Name: ...The Hosting Account... Account Domain: ...The Domain... Logon ID: 0x3e7 Logon Type: 10 Account For Which Logon Failed: Security ID: NULL SID Account Name: david Account Domain: ...The Domain... Failure Information: Failure Reason: Unknown user name or bad password. Status: 0xc000006d Sub Status: 0xc0000064 Process Information: Caller Process ID: 0x154c Caller Process Name: C:\Windows\System32\winlogon.exe Network Information: Workstation Name: ...The Domain... Source Network Address: 173.231.24.18 Source Port: 1605 The value in the Account Name field differs. Above you see "david" but there are ones with "john", "console", "sys", and even ones like "support83423" and whatnot. The Logon Type field indicates that the logon attempt was a remote interactive attempt via Terminal Services or Remote Desktop. My presumption is that these are some brute force attacks attempting to guess username/password combinations in order to log into our dedicated server. Are these presumptions correct? Are these types of attacks pretty common? Is there a way to help stop these types of attacks? We need to be able to access the desktop via Remote Desktop so simply turning off that service is not feasible. Thanks

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• Prevent Windows from resizing all the apps on the desktop when switching monitors

  - by Greg Hewgill

  Short version: When moving my laptop and sleeping between using different monitors, all my open windows are crammed into the upper left corner as if they tried to fit on the laptop internal screen resolution. I plug in and switch to the external monitor before unlocking my session. Is there a way to prevent this automatic resizing? Longer version: I have a laptop that I move between two locations. I have one docking station, and the same kind of monitor configured for 1600x1200, in both locations. The internal laptop screen is awful so I don't use it. Location A: Docking station, monitor connected via DVI. Location B: No docking station, external monitor connected via VGA cable. In this location I have the laptop lid open for keyboard access but I don't use the laptop screen. When moving from Location A to Location B, the laptop wakes up from sleep, displaying the screen on the internal monitor. I switch to the external monitor display (using Fn+F8 on this laptop), and only after that do I unlock my session with my password. However, Windows has crammed all my nicely arranged windows into the upper left corner as if it were trying to fit them all on the laptop internal screen resolution. When moving from Location B to Location A, I have the laptop lid closed when using the docking station so Windows apparently concludes the screen resolution is 1600x1200 and doesn't resize any windows. The laptop is a Dell Latitude running Windows 7 Professional.

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• Can't get past bootcamp Windows logo, freezes immediately after picking boot partition -- Windows 7

  - by cksubs

  Hi, I had a fine install of Windows 7 alongside Snow Leopard. I had a power outage, and Windows restarted. When I booted via the "Hold Option" sceen, it started hanging at the grayscale "Windows logo" (squares) that comes up after picking the Windows drive from the bootcamp loader (the Windows version of the grayscale Apple logo when OS X loads). I think this happened once before, and installing rEFIt helped. I did that, but it continued to hang at the same point. I finally got fed up with it and erased the Windows partition via Disk Utility. I then reinstalled Windows 7 x64 from DVD to the fresh partition. Seemed fine. Ran Windows Update then restarted. FFFFFFFFF. Hangs in the same place. What can I do? Like I said, I already have rEFIt installed. Booting the Windows 7 install CD results in the same infinite loading error. I don't have a spare Snow Leopard disk handy.

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• SSH connection problem - allowed from LAN but not WAN

  - by Kerem Ulutas

  I tried to setup my Arch Linux installation to be an SSH host, but here is the thing: I can ssh localhost, it fails to login via public key and asks for username and password, but still able to login. When I try ssh my_wan_ip it gives ssh_exchange_identification: Connection closed by remote host error. I've read all topics about this error and none helped me. By the way, just confirmed, it gives ssh: connect to host my_dyndns_hostname port 22: Connection refused from another machine (outside of my network, it has different wan ip). I have sshd: ALL in "hosts.allow", ALL:ALL in "hosts.deny". I am able to connect to my own pc via ssh, ping my own pc, but my ssh setup seems to be the problem, it gives that annoying error when I try to ssh from wan. /etc/ssh/ssh_config /etc/ssh/sshd_config And finally, here is the debug output for both sshd and ssh: (i ran ssh command and i took output to sshd debug after that): sshd debug ssh debug I can edit my question according to your needs. Just ask for any more information needed. BTW I have no iptables running. I have one cable dsl modem connected to a asus wl-330gE wireless access point, they both have their firewall disabled. I configured NAT so port 22 is directed to the pc I'm having this trouble. Any help appreciated, thanks..

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• Google bots are severely affecting site performance

  - by Lynn

  I have an aggregate site on a linux server that pulls in feeds from a universe of about 2,000 blogs. It's in Wordpress 3.4.2 and I have a cron job that is staggered to run five times an hour on another server to pull in the stories and then publish them to the front page of this site. This is so I didn't put too much pressure all on one server. However, the Google bots, which visit a few times every hour bring the server to its knees in the morning and evenings when there is an increase in traffic on the site. The bots have something like 30,000 links to follow at this point. How do I throttle the bots to simply grab the new stories off the front page and stop there? EDIT- Details of my server configuration: The way we have this set up is the server that handles all the publishing is an unmanaged instance via AWS. It mounts the NFS server and connects to the RDS to update content, etc. You get to this publishing instance via a plugin that detects the wp-admin link and then redirects you into there. The front end app server also mounts the NFS and requests data from the RDS. It is the only one that has the WP Super Cache on it.... The OS is Ubuntu on the App server and the NFS runs CentOs. The front end is Nginx and the publishing server is Apache.

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• fedora, dhcpd fails to start

  - by soxs060389

  History: I got a tiny shiny plugserver which I want to plug to my ADSL router (or however you want to call it) on one end (eth0), and the other end (eth1) I want to run a dhcp server for my LAN. ATM I am stuck with getting LAN to work. OS is fedora 12. I configured my /etc/dhcp/dhcpd.conf like this: # # DHCP Server Configuration file. # see /usr/share/doc/dhcp*/dhcpd.conf.sample # see 'man 5 dhcpd.conf' # option domain-name "unknown.org"; option domain-name-servers 192.168.44.1; option subnet-mask 255.255.255.0; option broadcast-address 192.168.44.255; default-lease-time 86400; max-lease-time 172800; subnet 192.168.44.0 netmask 255.255.255.0 { host fedorabigbox { hardware ethernet 00:19:66:8E:61:74; fixed-address 192.168.44.21; } #host mobile #{ # hardware ethernet ***; # fixed-address 192.168.44.22; #} range 192.168.44.100 192.168.44.110; option routers 192.168.44.1; } # this is just dummy, as read many howtos, some suggesting to add a subnet blah netmask blah for each interface subnet 192.168.33.0 netmask 255.255.255.0 { range 192.168.33.100 192.168.33.110; option routers 192.168.33.1; } But the server fails to start when trying to start it via /etc/init.d/dhcpd start In general it would be nice if someone can point me to a in detail explanation of how network works, I am pretty new to this stuff. More concrete question: How to point the subnets to eth1 and the other to eth0, how can this be achieved? Does someone see any errors or flaws? Syntax should be correct, allready checked that with the dhcpd syntax check. Thanks for any help

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• Rename Active Directory domain following Windows 2000 -> 2008 migration.

  - by ewwhite

  I'm working with a site that needs an internal DNS domain rename. It currently has a DNS name of domain.abc.com and NT name of ABC. I'm trying to get to a DNS name of abctrading.com and NT name of ABCTRADING. Split DNS would be used. The site originally ran from a single Windows 2000 domain controller hosting AD, file, print, DHCP and DNS services. There was no Exchange system in the environment. The 50 client PCs are all Windows XP with a handful of users using roaming profiles. All users are in a single OU and there are no group policy/GPOs. I'm a Linux engineer, but have been trying to guide another group of consultants to reach a more suitable setup. With the help of this group, we were able to move the single Windows 2000 system to a set of Windows 2008 R2 servers separated into domain controller and file/print systems (virtualized). We are also trying to add an Exchange 2010 system to this mix. The Windows 2000 server was demoted and is no longer in the picture. This is the tricky part, as client wants the domain renamed and the consultants aren't quite sure how to get through it without another 32-40 hours of testing/implementation. THey say that there's considerable risk to do the rename without a completely isolated test environment. However, this rename has to be done before installing Exchange. So we're stuck at this point. I'd like to know what's involved in renaming the domain at this point. We're on Windows Server 2008. The AD is healthy now. Coming from a Linux background, it seems as though there should be a reasonable path to this. Also, since the original domain appears to be a child/subdomain, would that be a problem here. I'd appreciate any guidance.

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• Manipulating IIS7 Configuration with Powershell

  - by John Price

  I'm trying to script some IIS7 setup tasks in PowerShell using the WebAdministration module. I'm good with setting simple properties, but am having some trouble when it comes to dealing with collections of elements in the config files. As an immediate, example, I want to have application pools recycle on a given schedule, and the schedule is a collection of times. When I set this up via the IIS management console, the relevant config section looks like this: <add name="CVSupportAppPool"> <recycling> <periodicRestart memory="1024" time="00:00:00"> <schedule> <clear /> <add value="03:31:00" /> </schedule> </periodicRestart> </recycling> </add> In my script I would like to be able to accomplish the same thing, and I have the following two lines: #clear any pre-existing schedule Clear-WebConfiguration "/system.applicationHost/applicationPools/add[@name='$($appPool.Name)']/recycling/periodicRestart/schedule" #add the new schedule Add-WebConfiguration "/system.applicationHost/applicationPools/add[@name='$($appPool.Name)']/recycling/periodicRestart/schedule" -value (New-TimeSpan -h 3 -m 31) That does almost the same thing, but the resulting XML lacks the <clear/> element that is created with via the GUI, which I believe is necessary to avoid inheriting any default values. This sort of collection (with "add", "remove", and "clear" elements) seems to be fairly standard in the config files, but I can't seem to find any good documentation on how to interact with them consistently.

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• dpkg broken while upgrading Debian Etch to Lenny

  - by artvolk

  Good day! While trying to recover a box to lenny it seems I've broken things. It upgrades libc and glib after that dpkg seems to be broken. I can run apt-get, but it gets segmentation fault from dpkg: # apt-get -f install Reading package lists... Done Building dependency tree... Done 0 upgraded, 0 newly installed, 0 to remove and 316 not upgraded. 9 not fully installed or removed. Need to get 0B of archives. After unpacking 0B of additional disk space will be used. /bin/sh: line 1: 4606 Segmentation fault /usr/sbin/dpkg-preconfigure --apt E: Sub-process /usr/bin/dpkg received a segmentation fault. I can login via SSH but even ls is not working: # ls Segmentation fault Is there anything I can do remotelly via SSH? # ldd /bin/ls linux-gate.so.1 => (0xffffe000) librt.so.1 => /lib/tls/i686/cmov/librt.so.1 (0xb7fc8000) libacl.so.1 => /lib/libacl.so.1 (0xb7fc2000) libselinux.so.1 => /lib/libselinux.so.1 (0xb7fac000) libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb7e51000) libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0xb7e3f000) /lib/ld-linux.so.2 (0xb7fd8000) libattr.so.1 => /lib/libattr.so.1 (0xb7e3b000) libdl.so.2 => /lib/i686/cmov/libdl.so.2 (0xb7e37000) libsepol.so.1 => /lib/libsepol.so.1 (0xb7df6000) It seems I've temporary fixed it with: # touch /etc/ld.so.nohwcap From here: http://saintaardvarkthecarpeted.com/blog/archive/2005/08/_etc_ld_so_nohwcap.html

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• Ubuntu 12.04 open port 80 inside WLAN

  - by Eduard

  I have an nginx server running on ubuntu 12.04 that serves http through port 80 and https through port 443. Everything works fine if I access it from the same computer via localhost, 127.0.0.1 or the local IP 192.168.0.11. If I try to access the server from another computer in the same VLAN it does not work for http; it works for https. I have changed my nginx configuration to also listen to port 8000 for http; I can then access http from the other computer in the same VLAN via "http://192.168.0.11:8000". I also have a web server running on port 80 on a windows machine and can access it from another device in the same VLAN, therefore the router is not blocking incoming http traffic. The nginx process is run by root. I have used tcpdump and I see that packets are arriving to Ubuntu: 192.168.0.16.49735 192.168.0.11.80 and that some response is being given 192.168.0.11.80 192.168.0.16.49735 (I do not know what the response is though). There is no request arriving at the nginx web server (I have checked the access log). I have iptables empty. I have unsuccessfully tried to find a solution for a long time to this, it has now become a matter of happiness or bitterness :).

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• For enabling SSL for a single domain on a server with muliple vhosts, will this configuration work?

  - by user1322092

  I just purchased an SSL certificate to secure/enable only ONE domain on a server with multiple vhosts. I plan on configuring as shown below (non SNI). In addition, I still want to access phpMyAdmin, securely, via my server's IP address. Will the below configuration work? I have only one shot to get this working in production. Are there any redundant settings? ---apache ssl.conf file--- Listen 443 SSLCertificateFile /home/web/certs/domain1.public.crt SSLCertificateKeyFile /home/web/certs/domain1.private.key SSLCertificateChainFile /home/web/certs/domain1.intermediate.crt ---apache httpd.conf file---- ... DocumentRoot "/var/www/html" #currently exists ... NameVirtualHost *:443 #new - is this really needed if "Listen 443" is in ssl.conf??? ... #below vhost currently exists, the domain I wish t enable SSL) <VirtualHost *:80> ServerAdmin [email protected] ServerName domain1.com ServerAlias 173.XXX.XXX.XXX DocumentRoot /home/web/public_html/domain1.com/public </VirtualHost> #below vhost currently exists. <VirtualHost *:80> ServerName domain2.com ServerAlias www.domain2.com DocumentRoot /home/web/public_html/domain2.com/public </VirtualHost> #new -I plan on adding this vhost block to enable ssl for domain1.com! <VirtualHost *:443> ServerAdmin [email protected] ServerName www.domain1.com ServerAlias 173.203.127.20 SSLEngine on SSLProtocol all SSLCertificateFile /home/web/certs/domain1.public.crt SSLCertificateKeyFile /home/web/certs/domain1.private.key SSLCACertificateFile /home/web/certs/domain1.intermediate.crt DocumentRoot /home/web/public_html/domain1.com/public </VirtualHost> As previously mentioned, I want to be able to access phpmyadmin via "https://173.XXX.XXX.XXX/hiddenfolder/phpmyadmin" which is stored under "var/www/html/hiddenfolder"

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• Change Windows 7 Explorer's Details Pane limits

  - by Paul

  For some reason, MS decided to completely kill the status bar's functionality in Win7 (and maybe Vista, but I don't know for sure). I have tried all possible options such as Classic Shell and so on. Basically, the one thing I miss most is seeing at a glance the total size of my selected files. I know I can press Alt+Enter or whatever, but that's not the point. The point is that the so-called 'details' pane stops providing details if more than 15 files are selected! WTH? Cannot understand the reason behind such a stupid arbitrary limit, that doesn't seem to be user-configurable at all. Anyway, what I'm looking for is a way to change that limit, either via the registry or otherwise. If changing the limit isn't possible, would it be possible for some programming genius to create a very small optimized light-weight non resource-hungry (you get the idea!) program whose sole purpose will be to automatically click the "Show more details..." link in the details pane after every file selection? For bonus points, the program should wait for a second or two after file selection is complete to do this, so that selecting multiple files in quick succession doesn't hit the HDD repeatedly. Any takers for the challenge? :)

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• OpenLDAP replication fails, "syncrepl_entry: rid=666 be_modify failed (20)"

  - by Pavel

  I've configured a second host to replicate the main LDAP server via syncrepl in the slapd.conf: syncrepl rid=666 provider=ldaps://my-main-server.com type=refreshAndPersist searchBase="dc=Staff,dc=my-main-server,dc=com" filter="(objectClass=*)" scope=sub schemachecking=off bindmethod=simple binddn="cn=repadmin,dc=my-main-server,dc=com" credentials=mypassword When I restart slapd, it writes to /var/log/debug Jun 11 15:48:33 cluster-mn-04 slapd[29441]: @(#) $OpenLDAP: slapd 2.4.9 (Mar 31 2009 07:18:37) $ ^Ibuildd@yellow:/build/buildd/openldap2.3-2.4.9/debian/build/servers/slapd Jun 11 15:48:34 cluster-mn-04 slapd[29442]: slapd starting Jun 11 15:48:34 cluster-mn-04 slapd[29442]: null_callback : error code 0x14 Jun 11 15:48:34 cluster-mn-04 slapd[29442]: syncrepl_entry: rid=666 be_modify failed (20) Jun 11 15:48:34 cluster-mn-04 slapd[29442]: do_syncrepl: rid=666 quitting I've looked into the sources for the return code and found only #define LDAP_TYPE_OR_VALUE_EXISTS 0x14 in include/ldap.h. Anyway, I don't quite get what the error message means. Can you help me debugging this problem and figure out why the LDAP replication doesn't work? I've managed to put a "manual" copy via slapcat and slapadd into the database, but I'd like to sync automatically. UPDATE: "Solved" by removing /var/lib/ldap/* and re-importing the database with slapadd.

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• What is the peak theoretical WiFi G user density? [closed]

  - by Bigbio2002

  I've seen a few WiFi capacity planning questions, and this one is related, but hopefully different enough not to be closed. Also, this is related specifically to 802.11g, but a similar question could be made for N. In order to squeeze more WiFi users into a space, the transmit power on the APs need to be reduced and the APs squeezed closer together. My question is, how far can you practically take this before the network becomes unusable? There will come a point where the transmit power is so weak that nobody will actually be able to pick up a connection, or be constantly roaming to/from APs spaced a few feet apart as they walk around. There are also only 3 available channels to use as well, which is a factor to consider. After determining the peak AP density, then multiply by users-per-AP, which should be easier to find out. After factoring all of this in and running some back-of-the-envelope calculations, I'd like to be able to get a figure of "XX users per 10ft^2" or something. This can be considered the physical limit of WiFi, and will keep people from asking about getting 3,000 people in a ballroom conference on WiFi. Can anyone with WiFi experience chime in, or better yet, provide some calculations for a more accurate figure? Assumptions: Let's assume an ideal environment with no reflection (think of a big, square, open room, with the APs spaced out on a plane), APs are placed on the ceiling so humans won't absorb the waves, and the only interference are from the APs themselves and the devices. As for what devices specifically, that's irrelevant for the first point of the question (AP density, so only channel and transmit power should matter). User experience: Wikipedia states that Wireless G has about 22Mbps maximum effective throughput, or about 2.75MB/s. For the purpose of this question, anything below 100KB/s per user can be deemed to be a poor user experience. As for roaming, I'll assume the user is standing in the same place, so hopefully that will be a non-issue.

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• Accessing a shared folder in Windows Server 2008 R2.

  - by Triztian

  Hello all, seems my involvement with computers has grown and I've found my self in the need to access a shared folder on a server. I've read some documentation and managed to set up the folder as a share, for this I created a local group and for now just one local user that has access to the share, the folder is in the public user folder and it's permissions should be (and I believe they are) read/write. The problem is that I can't connect from a remote machine I mean I don't know how the way it should be accessed, the server has a public IP and we use it also as a host to our website I don't know if that affects it though, the folder will be used as the "keeper" for the QuickBooks company files and has the database server manager installed. I've tried setting up a VPN Connection to the but no success. The server has a domain name a "http://www.example.com" that redirects to our website, I am unsure if it could be accessed that way, also the share has a location displayed when I right-click properties Heres what I've tried Setting up a VPN Connection (Windows Vista and 7) Got to the point where I got asked for credential and entered the user I created (which is not an admin) but I got a "Connection fail error 800" I suppose this is because in the domain field I entered the servers workgroup. right-click add network connection (Windows 7) Went through the wizard until I reached the point of entering the location, tried many things, the name in the share's properties(\\SOMETHING\Share), the http://www.example.com , the IP address I'm quite unfamiliar with this, so I have my guesses: Since the group and user are local they do not have access to the folder. The firewall in the server is blocking my connection. Anyways, any help and guidence is truly appreciated.

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• How to send email from home ip when the email server isn't a designated outbound mail server allocated to BT Retail customers [on hold]

  - by Mr Shoubs

  (I am sys admin!) I can receive email, but when I try to send an email from my home office via our work email server I get the following reply: Your message did not reach some or all of the intended recipients. Subject: Test Sent: 19/08/2014 17:02 The following recipient(s) cannot be reached: 'Joe Blogs' on 19/08/2014 17:02 Server error: '554 5.7.1 Service unavailable; Client host [my-ip-here] blocked using zen.spamhaus.org; http://www.spamhaus.org/query/bl?ip=my-ip-here' I went to that URL and it says the following: Ref: PBL231588 81.152.0.0/13 is listed on the Policy Block List (PBL) Outbound Email Policy of BT Retail for this IP range: It is the policy of BT Retail that unauthenticated email sent from this IP address should be sent out only via the designated outbound mail server allocated to BT Retail customers. Please consult the following URL for details on how to configure your email client appropriately. http://btybb.custhelp.com/cgi-bin/btybb.cfg/php/enduser/cci/bty_adp.php?p_sid=fPnV4zhj&p_faqid=6876 Removal Procedure Removal of IP addresses within this range from the PBL is not allowed by the netblock owner's policy. Going to this URL just says: This site has been disabled for the time being. Does anyone know what I should do to allow me to send emails from my home ip - the site suggests I can configure my email client? (note that I have configured the client to use smtp authentication)

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• Resolving loss of internet bandwidth in home network

  - by Caspar

  Recently, I've decided to connect my laptop at home to my modem/router through Ethernet cables built into my apartment. As these built-in Ethernet cables are usable via plugs built into the walls (called powerline adapters), I use some additional cabling (STP CAT6 cables) from my laptop/router to the plugs. In addition, I don't know any technical details about these built-in cables (as they're not visible), only the maximal bandwidth (1 GBit = Cat6?) that they're supporting. The built-in cables are Cat. 5e Ethernet cables. The problem is now that when I set up the connection, I cannot use the full bandwidth that my internet connection is actually offering (100 Mbit/s), only about 85 Mbit/s between 85 - 88 Mbit/s, despite the fact that all cables involved should support the maximal bandwidth. I know from other tests with one of the Ethernet cables in use that I can use almost 99 Mbit/s when I connect my laptop directly to the router/modem using only this one cable. In addition, it is very unlikely that the length of the resulting cable connection from my laptop to my router involving the built-in cables exceeds 100 m. So, what possible reasons for this loss of bandwidth exist? And how I can fix this issue? I hope this might help resolve the issue: The built-in cables appear to be Cat. 5e Ethernet cables. So, is there any problem when I connect Cat6 Ethernet cables directly to Cat5e Ethernet cables via the plugs?

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• Symantec NetBackup restore - Incremental backup

  - by w0051977

  We are using Net Backup as a corporate solution. Incremental backups are taken daily during the week and then a weekly backup is done at the weekend (Saturday). My colleague has restored a folder to how it stood at 14:00 on a Tuesday. The problem is that the restore is taking files from the weekend backup if they did not exist at that point in time of the restore. For example, the folder we are restoring should look like this (this is how it looked on Tuesday at 14:00): Folder1 (folder name) Test.txt Test1.txt Test2.txt The folder looked like this at the weekend when the full restore was done (even though it did exist at the weekend when the full backup ran): Folder1 (folder name) Test.txt Test1.txt Test2.txt Test3.txt The actual folder restored looks like this: Folder1 (folder name) Test.txt Test1.txt Test2.txt Test3.txt Test3.txt should not be restored because it did not exist at the point of the restore. Is there a setting somewhere that we are missing. The folder in question is 200GB - the example above is for simplification. I realise this is a basic question.

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• Application (was Firefox) crash on first load on Ubuntu Linux on older Dell Laptop

  - by Ira Baxter

  I've had a Dell Latitude laptop since about 2000 without managing to destroy it. A month ago the Windows 2000 system on it did something stupid to its file system and Windows was completely lost. No point in reinstalling Windows 2000, so I installed an Ubuntu Linux on the laptop. Everything seems normal (installed, rebooted, I can log in, run GnuChess, poke about). ... but ... when I attempt to launch Firefox from the top bar menu icon, I get a bunch of disk activity, the whirling cursor icon goes round a bit and then (WAS: everything stops: icon, mouse. Literally nothing happens for 5 minutes. Ubuntu is dead, as far as I can tell. EDIT : on further investigation, spinning icon, mouse operated by touchpad freeze. There's apparantly a little disk activity occuring about every 5 seconds. I wait 5-10 minutes, behavior doesn't change) A reboot, and I can repeat this reliably. So on the face of it, everything works but Firefox. That seems really strange. The only odd thing about this system when Firefox is booting is that while it has an Ethernet port (that worked fine under Windows), it isn't actually plugged into an Ethernet. As this is the first Firefox boot since the Ubuntu install, maybe Firefox mishandles Internet access? Why would that crash Ubuntu? (I need to go try the obvious experiment of plugging it in). EDIT: I tried to run the Disk manager tool, not that I cared what it was, just a menu-available application. It started up like Firefox, I get a little tag in the lower left saying Disk P*** something had started, and then the same behavior as Firefox. At this point, I don't think its the Ethernet. Is it possible that the Ubuntu disk driver can't handle the disk controller in this older laptop? The install seemed to go fine.

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• Including email, IMs, configs, etc. in documentation or notes

  - by Jason Antman

  The shop I work in is pretty laid-back. We're on a documentation kick, only because historically we've been very bad with it. We do a lot of our brainstorming in face-to-face meetings, and also do a lot of communication via IM in addition to email. While I'm usually pretty good about documentation and keeping copious lab notes, I just finished a build of a host and spent hours searching through IMs, emails, files on my workstation, etc. to pull out anything I missed in my lab notes, which formed a large amount of the basis for the internal documentation. Does anyone have any thoughts on, aside from manually saving things to a project directory, managing various data sources (especially email and IM) and tracking them on project basis? Ideally, I'd like an easy way to put copies of emails, IM logs, etc. into a project-specific directory on my workstation and then just have a cron job that syncs that up with a shared folder. This isn't really a candidate for anything more advanced, as the bulk of the data will be copies of configs, code, etc. Here are the big restrictions: Email is via a centralized Zimbra install, so nothing can happen server-side. My workstation is Linux. Aside from writing Pidgin and Thunderbird plugins that let me tag chats and emails as belonging to a project, and then copy them to the appropriate place... any thoughts? Suggestions? Thanks, Jason

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