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• Router loses connection to internet randomly

  - by tvanover

  I have a Belkin wireless G plus Mimo router and it randomly loses the connection to the internet. It seems to happen for a second or two, not enough to impact day to day browsing. But enough to disconnect games, or stall videos I am watching. It happens whether I am plugged into the router or connecting via wifi. I am unsure if it is my router or Comcast that is causing this issue. If I connect a computer directly to the modem the problem never occurs, so that tells me it is probably the router. But I also had a Netgear wireless router WGR614, and it had the same problem. I don't know where to start looking for the source of the problem. What logs should I be combing through? All my machines are win 7 of varying versions.

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• How do you apply development practices like version control, testing and continuous integration/deployment to system administration?

  - by arex1337

  Imagine you're going to manage a number of servers with a number of different services that's used by a number of people. Now say you want to reconfigure or replace some software on one of those servers. Obviously you don't want to work on servers that are in production. If this was a code change, as a developer, I would make the change on my local development machine, test it locally and commit the change to a version control system. The changes could then be deployed in a staging environment, tested further and finally deployed in a production environment. It would also be easy for me to roll back, if necessary. Generally, or specifically, how do you achieve this in system administration? (The first thing that comes to mind is to use virtual machines and put virtual machine images in version control, but I'm sure there is a lot of literature and clever solutions I'm not presently aware of.)

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• Link bonding across multiple switches?

  - by Bryan Agee

  I've read up a little bit on bonding nics with ifenslave; what I'm having trouble understanding is whether there is special configuration needed in order to split the bonds across two switches. For example, if I have several servers that all have two nics each, and two separate switches, do I just configure the bonds and plug 1 nic from each into switch #1 and the other from each into switch #2? or is there more to it than that? If the bonds are active-backup, will a nic failure on single machine mean that server may become disconnected since the rest of the machines are using the primary nic and it's using the secondary? Or do you link the switches with one cable as well?

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• Keeping Private SSH Keys Safe

  - by Carmen

  I have a central server where I stored all the private ssh keys to the different machines that I want to ssh to. Currently, only sysadmins have access to this 'central' server. Given the above scenario, I like to ask the following questions: How do you protect your private ssh keys? I read about ssh-agent but I am not sure how to use it or if it can be used in this situation. If a sysadmin leaves and he copies all the private ssh keys, then he has access to all the servers. How do you deal with this situation?

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• TeamViewer: How to disable color dithering for low-bit-depth screen settings

  - by gogowitsch

  I am using Terminal Services and TeamViewer a lot to access other computers, partly over slow networks. The problem described below is not affected by which of the two remote access services I am using. When accessing Windows 7 Professional machines, a great deal of text is hard to read as the background is dithered. Even for exactly the same colors, Windows 2003 does not seem to dither at all, but to choose the closest available color. I strongly prefer the latter, as I don't care for the exact colors, I just want to be able to read easily. I am not sure whether this is operating system-related. The programs on the remote systems do not allow me to change the color choices for the various backgrounds to anything sane. Is there a way to disable this color dithering using some target operating system setting that will do the trick for both Terminal Services and TeamViewer?

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• Is it possible to restrict fileserver access to domain users using computers that are members of the domain?

  - by Chris Madden

  It seems domain isolation can be used to accomplish, but I'd like a solution that doesn't require IPsec, or more accurately, doesn't require IPsec on the fileserver. IPsec if done in software has a large CPU overhead and our NAS boxes don't support any kind of offload. The goal is to avoid authenticated users using non-managed machines to access network resources. Network Access Protection (NAP) and the various enforcement points looked promsiing but I couldn't find a bulletproof way to use them [which doesn't require IPsec on the fileserver]. I was thinking when a domain user accesses the NAS box it will first need a Kerberos ticket from AD, so if AD could somehow verify the computer that was requesting the ticket was in the domain I'd have a solution.

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• Samba Server as domain controller

  - by garden air

  I am using centos 6.2 on my system. I want to make samba server as PDC to join the clients computers operating systems i.e xp,windows 7 and share their files & directories.Currently I have 200 PC running both windows xp and win 7. The question I want to as is does samba 3.5.10 has a capacity to join 200 computers as a domain controller & authenticate the users ? thanks garden Thanks for your guidence.Well at the moment I am using CentOS 6.2 and samba is installed using yum command. It is amazing that I can join samba as a domain comtroller of 200 clients machines. By the way what is samba maximum limit for joining number of clients PC's.

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• xen domUs crashes or unavailability

  - by Rush

  I've xen server with 8 domU. Server is Xeon E31270 with 16gb ram. I think it is enough for 8 machines. Sometimes domU's crashes and i can't figure out the reason. After crash i can connect to console and there is somthing like this: Oct 8 22:20:49 server kernel: [30892.320780] lowmem_reserve[]: 0 0 0 0 Oct 8 22:20:49 server kernel: [30892.320790] Node 0 DMA: 10*4kB 3*8kB 13*16kB 10*32kB 7*64kB 3*128kB 2*256kB 2*512kB 1*1024kB 2*2048kB 0*4096kB = 8080kB Oct 8 22:20:49 server kernel: [30892.320817] Node 0 DMA32: 648*4kB 2*8kB 1*16kB 0*32kB 1*64kB 0*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 5760kB Oct 8 22:20:49 server kernel: [30892.320842] 1491 total pagecache pages Oct 8 22:20:49 server kernel: [30892.320847] 0 pages in swap cache Oct 8 22:20:49 server kernel: [30892.320852] Swap cache stats: add 0, delete 0, find 0/0 Oct 8 22:20:49 server kernel: [30892.320858] Free swap = 0kB Oct 8 22:20:49 server kernel: [30892.320862] Total swap = 0kB Oct 8 22:20:49 server kernel: [30892.324024] 524288 pages RAM Oct 8 22:20:49 server kernel: [30892.324024] 11010 pages reserved Oct 8 22:20:49 server kernel: [30892.324024] 424467 pages shared Oct 8 22:20:49 server kernel: [30892.324024] 503538 pages non-shared Oct 8 22:20:49 server kernel: [30892.330308] apache2 invoked oom-killer: gfp_mask=0x200da, order=0, oom_adj=0 Oct 8 22:20:49 server kernel: [30892.330322] apache2 cpuset=/ mems_allowed=0 Oct 8 22:20:49 server kernel: [30892.330330] Pid: 23938, comm: apache2 Not tainted 2.6.32-5-xen-amd64 #1 Oct 8 22:20:49 server kernel: [30892.330337] Call Trace: Oct 8 22:20:49 server kernel: [30892.330349] [<ffffffff810b7180>] ? oom_kill_process+0x7f/0x23f Oct 8 22:20:49 server kernel: [30892.330358] [<ffffffff810b76a4>] ? __out_of_memory+0x12a/0x141 Oct 8 22:20:49 server kernel: [30892.330367] [<ffffffff810b77fb>] ? out_of_memory+0x140/0x172 Oct 8 22:20:49 server kernel: [30892.330376] [<ffffffff810bb59c>] ? __alloc_pages_nodemask+0x4e5/0x5f5 Oct 8 22:20:49 server kernel: [30892.330385] [<ffffffff810cc224>] ? do_wp_page+0x386/0x707 Oct 8 22:20:49 server kernel: [30892.330395] [<ffffffff8100c3a5>] ? __raw_callee_save_xen_pud_val+0x11/0x1e Oct 8 22:20:49 server kernel: [30892.330404] [<ffffffff8100c369>] ? __raw_callee_save_xen_pmd_val+0x11/0x1e Oct 8 22:20:49 server kernel: [30892.330412] [<ffffffff810cdfc7>] ? handle_mm_fault+0x7aa/0x80f Oct 8 22:20:49 server kernel: [30892.330422] [<ffffffff8130f906>] ? do_page_fault+0x2e0/0x2fc Oct 8 22:20:49 server kernel: [30892.330433] [<ffffffff8130d7a5>] ? page_fault+0x25/0x30 Oct 8 22:20:49 server kernel: [30892.330439] Mem-Info: Oct 8 22:20:49 server kernel: [30892.330443] Node 0 DMA per-cpu: Oct 8 22:20:49 server kernel: [30892.330450] CPU 0: hi: 0, btch: 1 usd: 0 Oct 8 22:20:49 server kernel: [30892.330463] CPU 1: hi: 0, btch: 1 usd: 0 Oct 8 22:20:49 server kernel: [30892.330466] Node 0 DMA32 per-cpu: Oct 8 22:20:49 server kernel: [30892.330469] CPU 0: hi: 186, btch: 31 usd: 0 Oct 8 22:20:49 server kernel: [30892.330472] CPU 1: hi: 186, btch: 31 usd: 60 Oct 8 22:20:49 server kernel: [30892.330476] active_anon:342076 inactive_anon:115398 isolated_anon:0 Oct 8 22:20:49 server kernel: [30892.330477] active_file:268 inactive_file:481 isolated_file:0 Oct 8 22:20:49 server kernel: [30892.330477] unevictable:1125 dirty:2 writeback:13 unstable:0 Oct 8 22:20:49 server kernel: [30892.330478] free:3410 slab_reclaimable:1718 slab_unreclaimable:6946 Oct 8 22:20:49 server kernel: [30892.330478] mapped:899 shmem:113 pagetables:35697 bounce:0 Oct 8 22:20:49 server kernel: [30892.330502] Node 0 DMA free:8036kB min:32kB low:40kB high:48kB active_anon:1144kB inactive_anon:1268kB active_file:8kB inactive_file:8kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:11792kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:224kB kernel_stack:16kB pagetables:1228kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Oct 8 22:20:49 server kernel: [30892.330518] lowmem_reserve[]: 0 2004 2004 2004 Oct 8 22:20:49 server kernel: [30892.330523] Node 0 DMA32 free:5604kB min:5708kB low:7132kB high:8560kB active_anon:1367160kB inactive_anon:460324kB active_file:1064kB inactive_file:1916kB unevictable:4500kB isolated(anon):0kB isolated(file):0kB present:2052320kB mlocked:4500kB dirty:8kB writeback:52kB mapped:3600kB shmem:452kB slab_reclaimable:6872kB slab_unreclaimable:27560kB kernel_stack:3528kB pagetables:141560kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:992 all_unreclaimable? no Oct 8 22:20:49 server kernel: [30892.330539] lowmem_reserve[]: 0 0 0 0 Oct 8 22:20:49 server kernel: [30892.330544] Node 0 DMA: 1*4kB 2*8kB 13*16kB 10*32kB 7*64kB 3*128kB 2*256kB 2*512kB 1*1024kB 2*2048kB 0*4096kB = 8036kB Oct 8 22:20:49 server kernel: [30892.330579] Node 0 DMA32: 609*4kB 2*8kB 1*16kB 0*32kB 1*64kB 0*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 5604kB Oct 8 22:20:49 server kernel: [30892.330605] 1522 total pagecache pages Oct 8 22:20:49 server kernel: [30892.330610] 0 pages in swap cache Oct 8 22:20:49 server kernel: [30892.330615] Swap cache stats: add 0, delete 0, find 0/0 Oct 8 22:20:49 server kernel: [30892.330621] Free swap = 0kB Oct 8 22:20:49 server kernel: [30892.330625] Total swap = 0kB Oct 8 22:20:49 server kernel: [30892.333018] 524288 pages RAM Oct 8 22:20:49 server kernel: [30892.333018] 11010 pages reserved Oct 8 22:20:49 server kernel: [30892.333018] 424367 pages shared Oct 8 22:20:49 server kernel: [30892.333018] 503658 pages non-shared Seems like there isn't enough memory for this domU. But there is no any memory problems reported in munin monitoring: As you see system uses around 0.2G and 1G is available. So my question is: Is it xen specific problem, that real memory usage and memory usage that shows munin are different (I've never seen such problems oh real hardware machines)? Or maybe it is just monitoring problem, that can't catch moment when there is unusual high load and domU go down? And how I can to defeat this problem? it is really annoying to catch messages in e-mail that domU went down. Btw, such situation was when domU had 2G memory.

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• Kill the Menu......

  - by Curdasss

  Downloaded and installed VM Player 3.0. two questions? 1.) Can I use Windows SMS to install the player on a users computer? If yes. Were can I find this information? 2.) Is there a hack of fix that allows me to kill/remove/hide the Player menus? I don't want the user to build new VM machines, just run the one want them to run. Not allowed to use Workstation or Ace to dist the vm Thanks

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• Missing management console for Symantec Antivirus, Corporate Edition

  - by Alex C.

  I work for a small (80 employees) non-profit organization. We have a Windows network with a domain. The file server is running Server 2003. A vendor recently installed Symantec Antivirus, Corporate Edition, ver. 10.1.8.8000. It used to be the case that when I logged in to the file server as administrator, I would see an icon on the desktop that took me to the management console for the antivirus software. I could check logs, statuses of client machines, set policies, etc. That icon is now missing, and I can't find anything relevant under the "Start" menu. There is an entry for Symantec Antivirus, but that only gives me the panel for the client process, not the overall management console for the whole network. I don't want to call the vendor back to fix this (I'm baffled how we lost the icon in the first place). Can someone offer some guidance?

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• Network backup for Macs and PCs - formatting question

  - by neilfein

  I'm trying to use a LaCie 2TB drive as an AirPort drive, for backup on a home network. We have one mac and two PC laptops. My plan is to create a Mac partition and a Windows partition. However, Disk Utility won't let me set the windows partition to Windows format; there's no option in the menu for it in the partition tab. Am I doing something wrong? Alternatively, is there a way to partition the drive with one partition that all three machines can see? We have a Mac G5 with 10.4 and two laptops with Windows 7. Thanks!

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• MSTSC Not working, disconnects shortly after connecting

  - by F4r-20

  I'm currently having a problem connecting remotely to a server. It is a brand new build Windows 2008 R2, remote users are enabled. I'm trying to connect from a Windows 7 machine. Everytime I remotely connect to the server it will stay connected for a matter of seconds (maybe 3-5) and then disconnect and I get the standard old cannot connect and list of reasons it could be. Then I cannot connect again and get this prompt until I restart the server. As soon as it's finished restarting, it happens all over again. The network and hardware configuration between the two machines is completely reliable. Does anybody know what else I could try? Thanks.

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• Is there a way to sort my windows within a screen session?

  - by jv1975

  I use screen and have ssh sessions open to a number of different machines from within my screen session. I'd like to keep them in order, for obvious reasons. Often I'll have to connect to a new machine which alphabetically/numerically should fit in between two existing windows. I can't find any way to reorder the windows other than with the "number" command, which swaps my current window with that at the number I specified. So adding a new window to the 15 I already have and then sticking it at position 2, while keeping all the other windows in order as well is cumbersome, to say the least, requiring swaps for all windows past #2. Is there anyway to sort the windows alphabetically? Or a way to "shift" all windows after a certain point up one spot? Or any other suggestions to insert a new window at an arbitrary point while still maintaining the order of all other windows? Thanks!

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• How can I make Windows XP bootable again?

  - by Scott Severance

  Some time ago, I replaced my hard drive. Foolishly, I imaged the individual partitions, not the entire drive. That meant that my system was unbootable. For my primary OS (Linux), that was no problem as I could simply re-run GRUB. However Windows XP remains unbootable. The machine in question is a netbook which doesn't have a CD drive or a restore partition, so I can't boot from a Windows CD and run fixmbr. How can I fix Windows? Here's a picture of what I see when I try to boot Windows from the GRUB menu: I don't actually have an XP CD, since of my two machines, the netbook in question has neither a restore partition nor a CD, and my other XP machine only came with a restore partition. So I'll also need a way to get hold of the necessary files.

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• How to Confirm working of Nginx Caching Proxy

  - by Mark

  I am having nginx on port 80 and apache on port 8080 on same server. I have configured nginx such that it act as reverse proxy(i am not sure whether its working or not) using this tutorial http://tumblr.intranation.com/post/766288369/using-nginx-reverse-proxy. steps i followed to verify proxy. opened same page on two different machines within an interval of 5 seconds. but in the apache access.log every request is showing 200 response code.Does that indicate that caching is not working? and nginx access.log is showing nothing.

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• Remote kill, upload, execute file

  - by Masoud M.

  I'm developing a program and I need to upload my xyz.exe file to many host machines and execute them frequently. I need a server-client tool to do it as below steps after an update signal from my PC: Those host machine should kill any running processes with name xyz.exe. Download my new xyz.exe. Then execute new xyz.exe. I know about some tools like PsExec, but I need a tools with better user-interface and more powerful. Is there any tool to do it ? UPDATE: The systems are in a same LAN, OS is windows (XP or 7), No full remote access is needed. I'm a developer and my program should run in remote hosts and I'm testing my application.

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• Virtual environment firewall with CSF + iptables rules on VM?

  - by luison

  We are getting into virtualization with a Proxmox VE (OpenVZ + KVM) server. Our plan for firewall is to have CSF (http://configserver.com/cp/csf.html) running on the host machine as we've had a reasonable good experience with it in the past. Apart from that we plan simple firewall rules on the VM machines (mostly OpenVZ containers with same kernel) and maybe fail2ban simple specific rules. I would appreciate comments with anyone with similar experiences? I understand all traffic comes via the host machine so a combined firewall there with specific firewalling on the VM should work, alltough some iptables rules are hard to get to work on OpenVZ containers.

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• Generic tool to configure startup applications on Unix

  - by srid

  Is there an automated deployment tool that manages startup applications on a variety of machines, especially the Unices? Or is the only hope to study the nuts and bolts of each Unix (osx, linux, solaris, hpux, aix) on how to configure applications to launch on system startup? I want to run them as a specific user, instead of root. At the moment, I run them all within a screen session .. which is a hassle, as this requires manual intervention every time the machine is rebooted for some reason. Ideally, I am looking for a tool that would read, say, ~/.startup-programs which file contains, on each line, the command line to launch the needed daemons. And this tool should work on OSX, Linux, Solaris, HPUX and AIX ... writing the appropriate startup scripts for each platform.

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• Microsoft IME + Japanese: Force Hiragana input by default?

  - by Mica

  I am using Windows XP SP3 and Windows 7. On both machines, I cannot make Hiragana the default input method. Is there a way to do this? In the IME tool bar, there is the option to set the "Input Mode." This is always defaulted to "Direct Input." I would like to default to Hirgana or Katakana. I have found the setting dialog for this, by right clicking on the IME toolbar - settings - Japanese IME Standard - Properties - Default Input Mode. This setting seems to have no effect, no matter the combination of selections in the dialogs. Is there a way to reliably set the default Input Mode?

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• How to use windows desktop from a linux machine in a local network?

  - by Hristo Hristov

  I have a computer running Windows 7 with no monitor or keyboard, connected to a local network. I have a few laptops running linux, also connected to the local network. I want to feel like I'm sitting in front of the windows, but using one of the linux laptops. How to do that? Maybe I can use some linux software to connect to remote desktop? Or I have to install client/server software on both machines? As this is a local network, I expect excellent experience with no lag. Thank you!

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• Blocked connections passing through firewall. What is wrong?

  - by Kiranu

  In our company we have a small business router (Cisco RV082) on which we are using its standard configuration (block all incoming traffic). We also have an SMTP relay configured (using WS2008R2) so that our internal applications can send email through google apps (which requires authentication). The thing is that the server was being used to send spam. We fixed the problem by only allowing the server to relay email from our internal IP address range (10.0.0.0/16). My concern is that there was a way by which external IPs connected to the network and that underlying problem has not been fixed, but I cannot imagine how these machines connected. Any thoughts?

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• Windows 7 Firewall configuration

  - by Will Calderwood

  I had a PC set up with a VPN. I used the Windows 7 firewall to block all NON-VPN traffic to the internet, but all LAN traffic was allowed. So, with the VPN connected I could connect to all networked machines and the internet. Without the VPN connected I could only connect to the LAN and had no internet access. Unfortunately my drive failed, and I'm setting up the machine again with a replacement drive. I can't for the life of me work out how to set up the firewall again. I can easily set it up to block all NON-VPN traffic, but can't work out how to that and still allow all LAN traffic whether the VPN is connected or not. Some pointers would be useful. Thanks.

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• How realistic/easy is it to host our own web servers?

  - by morpheous

  It is increasingly looking like we will need to host our own servers, because we need modems physically attached to the server machines. I (think) we will need a T1 line to our office for starters. Dont know what else is involved other than the obvious redundancy and failover requirements. My questions are: Do we really have to do it our selves or can we find a service that allows the modems to be remote as well? If we have to host the servers ourselves, what are the steps (technical and operational) required?

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• Set Default Program for All Users on Server

  - by MattN

  I work with a large server environment that's running Windows Server 2003, 2008, and 2012 now on some boxes. We have a custom-built log viewer program that associates with two file types that I'd like to set to be the default program for all users across all boxes, so new users don't have to set the default program themselves on every box they log into. Ideally I'd like to have a simple registry script we could push out to all machines at once. I realize this likely means changing the registry entries for either HKCR or HKLM for the file extensions, but adding the program location with %1 extension to \shell\open\command value in HKLM simply opens the program and does not also load the log file. Am I just missing an open and play setting, or am I looking at this entirely wrong? (And I know the script will need to be different for 2003 and 2008, but changing the version for two scripts isn't hard) Thanks!

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• Folder Redirection won't load on Windows 7 Machine in Windows 2008 R2 Network

  - by leeand00

  Okay so redirected profiles don't load exactly, but the computer is joined to the network and it won't display any of the users files on their desktop that are in their redirected profile. I know this because we have a Terminal Server and when the user logs in there, her files appear. I checked the users' profile in Active Directory Users and Computers and compared it with a working users profile. When that didn't turn up any differences, I looked at her computer and found that on the Dial-in tab the Network Access Permission wasn't set to Control access through NPS Network Policy like it was on the other machines on the network; so I selected it, ran gpupdate /force on her machine and rebooted. This did not fix the issue. Is there anything else that could be preventing the redirected files on the users desktop from showing up when the user logs in?

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