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Articles indexed Saturday November 2 2013

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• Light Voip and IM server for small teams

  - by Sihan Zheng

  So I have a small group that would need a self hosted Im/voip and possibly video conferencing solution. My goal is for a small group of people (no more than 40) to be able to collaborate within a local area network. I need something that is self hosted, so unfortunately outside solutions like Skype and hosted Lync would not work. I'm looking for something that would allow both one on one, and group communication, so and IRC server would not work. I'm hopefully looking for something that does not require multiple servers, or is too complex to set up. As a student, I have a license of Lync 2013, but setting that up on a single server without active directory is practically impossible. Would Lync 2010 be easier to do on a single server? Are there any other good solutions? Thanks

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• AWS EC2 instance not pingable or available in browser

  - by Slimmons

  I've seen this questions asked other places, but now I've run through every fix proposed in other questions so I'm re asking it here, in hopes that someone will have a different solution. Problem: I have a EC2 instance, and I can ssh into it and work on it, and I have a Elastic ip set to it. I am unable to ping this machine, or log in to it using my browser. Solutions mentioned and tried: service httpd start i. response I get is "unrecognized service" ii. when I run apache2ctl -k start, it shows "httpd already running", so I'm assuming httpd is not the problem, it's just possibly named something else because of apache2, or for whatever reason. I went into EC2-Security Group- Default (which is the one I used.)-inbound, and everything there is set up correctly (I'm assuming). There it shows 80(HTTP) 0.0.0.0/0. 443(HTTPS) 0.0.0.0/0, and various other servies with their ports and 0.0.0.0/0 next to them. I also enabled a rule for enabling ICMP Request All on 0.0.0.0/0 temporarily for testing purposes I've tried disabling the iptables with "service ufw stop" Just in case I'm doing something really stupid, because I'm not all that used to connecting to web servers that I've spun up, I'm typing in the address to the machine into the url like this (assuming my ip address was ip.address). i. http:/(slash)ip.address/ ii. ip.address iii. https:/(slash)ip.address/ iv. ip.address/webFolderName/ v. http:/(slash)ip.address/webFolderName/ None of the attempts worked, and the only thing I haven't tried that i've seen is to start wireshark on the machine, and see if the requests are reaching it, and it's just ignoring them. I'm not sure I want to do that yet, since A). I'm not 100% positive how to use wireshark without the gui, since it's the only way I've ever used it (I really should get used to it in terminal, but I didn't even know you could). B). It really seems like I'm missing something simple in getting this to work. Thanks in advance for any help.

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• Use Dropbox as Offsite Enterprise Backup Solution [on hold]

  - by chris

  For my small company, I'm using Tomahawk Backup as the enterprise offshore solution, as it covers files, databases and Exchange (brick level). The problem is the price... it costs more than 10x the price of Dropbox (and others) for the same space (120GB), and doesn't have de-duplication. So I'm wondering: assuming there is no problem with backing up files only (ie copying the exchange store file and the db files to the Dropbox folder), would Dropbox be suitable as the offsite backup solution? Thanks

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• Symbolic directory link shared in domain

  - by Sabre

  We have a file server that is 2008R2 STD, it is a member server in a 2008 AD. I need to relocate some of the files and directories and would like to do it behind the scenes more or less without impacting the users. (Reason for this is that some of the files, due to recent software changes, HAVE to be located locally on one of the workstations, but they can be accessed by other applications remotely.) So symbolic links seem the panacea here, I moved a directory to another network share in the same domain (Windows 7 professional), created a symlink to it in the location it used to be in, named it the same thing, and to the local user it seems almost transparent. I.E. When logged into the desktop of the file server, I can go to the directory, open the link, it leaps to the other share as if it were local, exactly what would be expected. Then I tried it from another client computer (Windows 7 professional as well), went through the normal provisioning of R2R and L2R with fsutil... No joy. What I am getting is an access denied "Logon failure: Unknown username or bad password." using the same account that I log on locally to the file server with (Which happens to be the domain admin) So I cannot believe it is telling the truth, or... I assume it is not passing the credentials I am connecting to the first share all the way through the symlink. The end result is I want users on the domain to browser to share A, inside share A is a mixture of directories/files that reside there, and symlinks to directories/files on the second machine over the network in the same domain. Possible? Or am I misunderstanding how the symlink should work?

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• Windows Server 2003 DC hangs after network drivers update

  - by tcv

  Earlier today, we attempted to update the Broadcom BCM5716C network drivers on a Windows Server 2003. (Dell PowerEdge T310, FWIW). Since then we have not been able to boot the server in any normal mode. Safe Mode works. Safe Mode with Networking and regular bootups hang at "Applying Network Settings." I haven't tried Last Known Good Configuration nor have I tried Directory Services Restore Mode. I should also mention that the longest I've allowed "Applying Network Settings" was perhaps 30 minutes. I spoke to Dell since the server is under a basic warranty. They sent me the original Broadcom drivers. The trouble seems to be, however, that since I can only boot in Safe Mode, I can't install the application package as given. In safe mode, I receive the error: "The system administrator has set policies to prohibit this installation." I can install the drivers independently, but that doesn't allow the NICs to work. The most I've been able to get are Code 10 errors on each NIC. I plan to get back to the site tomorrow to attempt installation of a different NIC. I'm wondering what else I can try.

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• Safer RAID5 rebuilds using partially failed disks?

  - by arcticmac

  There have been lots of articles posted recently about how RAID5 is dangerous because of long resilver times, and in particular because of increasing chances of encountering a URE during the resilver. Obviously this is a significant concern. However, it seems that in many cases of interest (as long as you're keeping some kind of eye on your disks), when it comes time to rebuild the array, the disk that I'm replacing is still mostly readable. If you try to explain this predicament to the average layperson, they are typically very confused as to why you have two almost completely functional disks but can't produce one working array. It seems to me that there ought to be some way to take advantage of this to make rebuilds safer, as long as I'm willing to have the RAID5 be read-only for a couple of days while it rebuilds. Conceptually, what I have in mind looks something like this: When a disk fails, immediately take the RAID5 offline or mount it read-only Attach a new disk (either in a spare bay, or externally via eSATA) and begin rebuilding it to replace the failed one. If known, perhaps start with the stripes in which the failure occurred, to minimize the chances of losing those if another disk fails. In the event that a second disk experiences a URE or other failure during the rebuild, try to source that data from the disk that is being replaced. Presumably if this happens, more rebuilding would be necessary. When complete, shut down the server, swap the replacement drive into the original bay if desired, and bring the array back up. Obviously such a process would not be appropriate for applications where uptime is critical or data loss cannot be tolerated, but it seems to me that this could help considerably to improve the reliability of RAID5. I assume that there's not a good way to implement a recovery like this at present, given that I haven't seen any indication of tools that are designed to do this, and that it seems like it would be rather obtuse to work out manually. Are there also technical issues with it that I haven't thought of (I'm still fairly new to RAID stuff)? Any thoughts on how hard something like this would be to implement (e.g. in linux md raid)?

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• "Breadcrumbs" for series of hostnames?

  - by Hamy

  Does anyone know of a shell that would show a series of breadcrumbs as I navigate into/out of various servers, like this: Home > Build Machine > Vagrant > Docker-base Hopefully it could auto-detect logging in and out of various boxes and display the hostnames. Perhaps with a simple "no circular links", one could just try and monitor the hostname, but I don't know if there is a shell that can easily act as a 'parent' to the other shells on these various systems so that it can query hostname and/or other item. Any thoughts?

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• SSLCipherSuite - disable weak encryption, cbc cipher and md5 based algorithm

  - by John

  A developer recently ran a PCI Scan with TripWire against our LAMP server. They identified several issues and instructed the following to correct the issues: Problem: SSL Server Supports Weak Encryption for SSLv3, TLSv1, Solution: Add the following rule to httpd.conf SSLCipherSuite ALL:!aNULL:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM Problem: SSL Server Supports CBC Ciphers for SSLv3, TLSv1 Solution: Disable any cipher suites using CBC ciphers Problem: SSL Server Supports Weak MAC Algorithm for SSLv3, TLSv1 Solution: Disable any cipher suites using MD5 based MAC algorithms I tried searching google for a comprehensive tutorial on how to construct an SSLCipherSuite directive to meet my requirements, but I didn't find anything I could understand. I see examples of SSLCipherSuite directives, but I need an explanation on what each component of the directive does. So even in the directive SSLCipherSuite ALL:!aNULL:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM, I dont understand for example what the !LOW means. Can someone either a) tell me the SSLCipherSuite directive that will meet my needs or b) show me a resource that clearly explains each segment of a SSLCipherSuite is and how to construct one?

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• Cannot set MemOpMode or ProcVirtualization with syscfg.exe

  - by EGr

  When attempting to set MemOpMode or ProcVirtualization with syscfg.exe, I get the following error: C:\Users\EGr>syscfg --MemOpMode=AdvEccMode System Services or CSIOR disabled In the past, I have been told that this can be resolved by forcefully reinstalling the Dell Lifecycle controller firmware, and then trying again; however, I cannot find my notes on how to do that. Has anyone ever run into this issue, and does anyone know how I can fix it? If it is possible to forcefully reinstall the firmware, how would I do that? I've tried running the installer, but it fails after running for ~2 min. I believe there is a way to fix this as well, by adding/modifying a registry value at HKLM\System\Control\CurrentControlSet\Services\IPMIDRV (that might not be the correct path, but I know it is IPMIDRV). Is this a common issue? What is the actual cause of it?

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• Can't change to Korean-named directory on my debian server

  - by DaLynX

  I made a rsync backup of some directories from a macbook laptop to a debian server. Some of these have korean characters (Hangeul) in their names. After fixing my server's locale, it displays well when I do a ls for instance. But I can't cd to it. Example: $ ls -1 | head ??? dirA dirB … But if try to go browse that directory: $ cd ? ? ? cd: 3: can't cd to ??? Any idea what's wrong and how to fix it ?

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• Renamed Windows 2008 R2 domain ---WindowsXP client could not updated with new Domain name

  - by satishap

  I have renamed Windows Server 2008 R2 with all the steps using rendom,repadmin,gpupdate and successfully updated domain. My windows vista and above client got updated new domain when restarted. The help taken is from site http://www.youtube.com/watch?v=RwXyi1_UDWo But problem is with windows XP clients, they could not get new domain logon screen ans showing old domain name in logon screen.. Kindly anyone help me.........

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• OpenVPN performance: how many concurrent clients are possible?

  - by Steffen Müller

  I am evaluating a system for a client where many OpenVPN clients connect to a OpenVPN server. "Many" means 50000 - 1000000. Why do I do that? The clients are distributed embedded systems, each sitting behind the system owners dsl router. The server needs to be able to send commands to the clients. My first naive approach is to make the clients connect to the server via an openvpn network. This way, the secure communication tunnel can be used in both directions. This means that all clients are always connected to the server. There are many clients summing up over the years. The question is: does the OpenVPN server explode when reaching a certain number of clients? I am already aware of a maximum TCP connection number limit, therefore (and for other reasons) the VPN would have to use UDP transport. OpenVPN gurus, what is your opinion?

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• Exchange 2003 resource scheduling with mixed client versions

  - by Daniel Lucas

  We run Exchange 2003, but have a mix of Outlook 2003/2007/2010 in the environment. We have three rooms that need to be configured as resources. Some observations we've made with resource scheduling/booking are: Outlook 2010 users have trouble with the native Exchange 2003 resource scheduling method and require direct booking to be configured via registry Outlook 2007 users are unable to use direct booking (is this accurate?) Outlook 2003 users can only use the native Exchange 2003 resource scheduling method (is this accurate?) Direct booking cannot be combined with the auto-accept agent What is the correct way to setup resource scheduling in a mixed environment like this? Thanks, Daniel

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• Blank desktop when logging into a Virtualized Windows 2008 Terminal Server?

  - by Rachel

  We have a Virtualized Terminal Server running Windows Server 2008. When the admin user logs in, everything is fine. When anyone else logs in, their desktop and start menu is blank (they have the taskbar, start button, and quick launch links though). If I go into Windows Explorer, I can see icons in their desktop folder (although the icon image is missing and it is just displaying the generic icon), but can't run any of them. If I login with a user that is part of the Administrator group in Active directory, I get the same behavior except I can launch the programs found in the Desktop Folder of Windows Explorer. I cannot drag these items out onto the desktop though - The cursor doesn't allow me to drop them. From Task Manager I can see that explorer.exe and dwm.exe are both running. The Authenticated Users and Interactive groups are both under the Users group, along with our network's Domain Users group. Does anyone know why this is happening and how I can fix it? Also, not sure if it's related but about 1 in every 3 logins just hangs at a completely blank blue screen (no start button, taskbar, or quick launch buttons) and needs to be disconnected / reset by an admin. Edit I just noticed that the desktop itself doesn't even respond to click events. It's almost like the entire desktop is missing. At first I thought it didn't respond to right-click events because of an AD policy, but then I noticed if you open the Start Menu and click the desktop, the start menu doesn't shut like it should

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• How do I troubleshoot root cause of a hung windows (2003) server?

  - by GregW

  I have a pair of Windows (2003 Server) servers both running MS SQL Server (2008 EE) that each hang every few months. This has been occurring intermittently :( for the past 15 months pretty much since we started using the servers. The symptoms are as-follows: I cannot remote desktop in to troubleshoot; when I attempt to, I get stuck on a blank black screen and am never offered a login prompt I can still ping the servers I can still open a SQL connection to the server, and, CURIOUSLY/BIZARRELY, when I do a "select getdate()", the time it returns appears to be stuck on the exact fraction of a second when (I presume) the server hung. Repeated attempts to do "select getdate()" keep getting that same date, suggesting that the clock is frozen. Filesharing attempts to connect to the hung server fail with the error message: "\ServerName is not accessible. You might not have permissions to use this network resource. Contact the administrator of this server to find out if you have access permissions. The server's clock is not synchronized with the primary domain controller's clock." This is consistent with a frozen clock. Post-reboot, if I investigate the Windows Event Viewer logs, I can see many security accesses (coming from me and others) that I recognize were login attempts during the "down" period, but all of them in the security log are associated with that same timestamp of when the server hung. This also suggests the clock is frozen. There is not a clear cause in the Application or System event logs. I have a local Admin account on the server and am in the process of getting a domain-credentialed Admin account for better remote admin access. HP is supposed to be supporting these machines and has some low-level ILO2 access but they seem incapable of finding the root cause. A reboot will "fix" the problem but I would like to get to the root cause and solve the issue. Has anyone ever seen something like this odd clock behavior?! (If it were just one server I'd perhaps say a bad hardware clock, but two?) Can anyone advise me on what I should try to troubleshoot this sort of situation to find the root cause (or what I should tell HP to try?)

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• Permission denied accessing windows firewall

  - by Simon Sabin

  It doesn't matter who I am logged in as I am getting the following error in the mmc console when I launch the firewall advanced settings There was an error opening the Windows Firewall with Advanced Security snap in You do not have the correct permissions to open the Windows Firewall with Advanced Security console, You must be a member of the Administrators group or the Network Operators group to perform this task. For more information, contact your system administrator. Error code: 0x5. Ive tried processmonitor to identify what permission is being denied but no luck. If I run netsh directly I get access denied as well. This is running windows server 2008 SP2. And yes I was running as an administrator. Any ideas?

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• Why suddenly DOS-type hexadecimal file names?

  - by Marvin Nicholson

  One of the fairly recent folders on my XP SATA data drive suddenly shows DOS-type hexadecimal file names (i.e., eight characters with three-character extensions) I deleted them and now my Recycle bin shows them with a tilde (i.e., 194ABE~1.JPG). The images are all valid but the file names I assigned are gone. (The 2-terabyte SATA data drive has no OS, if that matters.) The last time this happened on an IDE drive, I was able to back up all the remaining files just before the drive died. Am I facing the same scenario now with my 2-terabyte SATA data drive? It is only a couple of years old. Should I quickly buy another one and back up 20 years of files to it before my current drive dies?

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• How to remove that extra text from URL titles in Firefox browser?

  - by amar

  I am using Firefox with Vimperator. On Mac I use Shiori to bookmark. I also use Pinboard's default add-on (on both Mac and Windows, but mainly on Windows as there's no Shiori). When I used to bookmark, I had this behaviour[A] (before changing Vimperator options): Example: URL: xyz.com TITLE: xyz website Pinboard add-on would fetch the title as xyz website which was fine (I reckon it directly fetches TITLE form the URL). But after installing and starting to use Shiori the title I was getting in its "title" field was xyz website - Vimperator exactly the same what I could see in tabs (seems it's getting what the browser is feeding it). So, I :set titlestring= in Vimperator to remove that extra Vimperator from title. Now, this is what I am getting [B]: When I try to bookmark using Pinboard add-on the title is undefined Using Shiori it results in xyz website - undefined. I tried to change it back to original[C] :set titlestring=Mozilla Firefox (assuming this was the original, before Vimperator) but the results are still the same as [B]. How to get read of that extra - undefined or that extra - Vimperator or - Mozilla Firefox for that matter, while bookmarking pages either with Pinboard add-on or Shiori? One workaround is, instead of no string just add a white-space while setting title in Firefox via Vimperator there but that results in - appended to titles.

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• Spots appear in a rectangle area on screen, ubuntu gnome 13.04, nvidia driver

  - by frozen-flame

  I am using Ubuntu Gnome 13.04 with nvidia-310 driver installed. My GPU is GeForce GTX650. Strange spots freqently appear on screen, with following traits: Spots are restricted in one or two rectangle areas at any instant. When typing, the pattern of spots change. Possibly increase, or all disappear when one key pressed. Mouse movement also influences. This problem last within one boot. The only way can I get rid of this problem is to reboot. It can be detected as soon as entering desktop if it appears. Simultaneously, the "power off" option is lost in the top-right menu of Gnome3. Never such problem when using windows 7 on the same computer, neither ubuntu with Nouveou driver. Seldomly, half of the screen become black. I googled a lot. Similar conditions are described, but no confirmed solution. Uninstall-r einstall strategy does not work. Any clue solving this will be appeciated.

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• grub-efi refuses to chainload Windows 8.1

  - by Alexei Averchenko

  I have installed LMDE (with grub in MBR) after I installed Windows 8.1. I then installed the grub-efi package and added the custom Windows options: #!/bin/sh exec tail -n +3 $0 menuentry "Windows" { search --fs-uuid --no-floppy --set=root A89A-7F4C chainloader (${root})/EFI/Boot/bkpbootx64.efi } menuentry "Windows (backup bootloader)" { search --fs-uuid --no-floppy --set=root A89A-7F4C chainloader (${root})/EFI/Microsoft/Boot/bkpbootmgfw.efi } These are basically a leftover from my older Ubuntu setup. However, grub is refusing to load them, complaining about the invalid signature. What do I do now?

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• Proper procedure - sftp access to www folder - To be able to upload files

  - by Jay

  My www folder is root:root. What should it be? My site works perfectly but maybe I am doing something wrong. My nginx.conf says user is 'nginx'. Should I be changing the www onwership and group to that or something else? Mainly I want to be able to sftp into the www folder using FileZilla. Preferably only allow access to the www folder. I want to be able to upload the website files but I just don't know the proper procedure. I have tried changing owners and groups but I get worried some part of the stack will not like it. For example does nginx play along, and php? I thought about having a sftp group or even an sftp user. But I don't want to go down a path that should be avoided. What should I be doing with my setup?

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• Ubuntu not showing disk

  - by ojek

  I have a laptop which had broken windows 7 installed on it. I created a ubuntu live usb and tried installing ubuntu over that win7. After a few minutes, I got an error message, so I needed to restart the computer. Now the laptop says that there is no bootable device - reasonable message given that there was an error during linux installation. But: Bios can see my hard drive, When I start ubuntu in live mode, and try either sudo fdisk -l or gparted, it doesn't show any hard disk drives. I am 90% sure that hdd is broken, but it is wierd that bios can see it, and ubuntu doesn't. How can I be 100% sure about that hdd? Is there any additional way of detecting my hdd from ubuntu?

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• Direct Link to IRC Server with Double ##

  - by bemental

  Trying to create a direct link to an IRC channel with double octothorpes (##). Freenode policy dictates off-topic channels require ## before the channel name. This O'Reilly 'hack' post gives solid instructions for how to link to a channel and open in the default client on a system, but no guidance for channels with doubles. Links to single channels are formatted as "irc://irc-server:port/channel?key"

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• Computer won't power on

  - by briskmojo

  Was working fine for over a year, now won't boot. LEDs on the GFX card and one on the MOBO labeled PWR glow when plugged in, but nothing happens when I push power and shorting switch pins does nothing either. If I pop out the CMOS battery and put it back in then try the fans lurch but nothing happens. Shorting the 15 and 16 pins turns the PSU on, and when the 24pin connector is attached to the MOBO it will start up briefly then stop. If I plug in the CPU header it returns to what I described, no power but will lurch after replacing the CMOS battery. Should I be shopping for a new PSU or is there another problem maybe?

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• Broken UAC, cant edit File/folders or change settings in user account

  - by Antoros

  It appears that UAC is broken cant move/delete some file/folders, when asked to use administrative right (and say yes) it shows the loading bar and then nothings gets moved/deleted, no error whatsoever opened control panel, user account and when i click on any option with the Shield (administrative rights) the mouse changes to loading and thengo back to normal, not opening any menu or showing any error Already done a sfc /scannow , no errors found Already used Microsoft's Fix it, reclycle bin broken and repaired, still the same error Used microsoftaccounts tool , this are the errors i got: Problem with microsoft account policy... <- this is the problem (didint fix) Trust this PC <- loop of redirections, cant get to trust this pc (only one with w8) Problems witht sytem registration : i think it is because of the soft system reset Some setting have sync turned off : i never configured anything to sync Rootcauses found and created logs : would like to know where the logs are saved... had to use a ".reg" file to change uac setting to never notify, thinking it would fix this, no, it stoped asking though, i can still open a cmd with Administrative rights, but cant access to UAC settings Accesed Administrator account (net user administrator /active:yes)and even with that account could change any settings so there it is, dont know what else to do in the moment (this pc broke with 8.1 update and was restored to factory configuration, it broke several drivers and kept most of the registry entries, i cant find the cause of this problem. other info: i tried to delete a file in a program folder and couldnt, downloaded unlocker to check first if it was permissions but no, it showed me a msg telling me that there wasnt any error, and if i would like to delete it, clicked on yes, and it did delete it, what amuses me is that i cant without this tool, not even using the feature that takes over ownership Edit: wow, in a not crappy pc chkdsk is fast, completed with no errors found : /

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