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• Debian, CentOS, Slackware, FreeBSD, OpenSolaris and Ubuntu Server Edition: Which one to use for an http web server?

  - by Ako

  I am going to install and administrate a virtual server for a small university. The server should run inside a virtual machine (VirtualBox OSE). It is only used in the university network and is invisible to the outside world. It should run Apache web server for PHP, MySQL and probably a mail server. I don't know which OS to use. Main criteria for choosing include ease of administration and updating, package management and performance. I wonder if anyone has any suggestions? And candidate OSs are: Debian, Ubuntu, CentOS, Slackware, FreeBSD, OpenSolaris. Add any other OS if you know any better alternatives.

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• Dhcp clients fail after successful import of server to new machine

  - by Tathagata

  I transfered the configs of a dhcp server from one server to another both running Windows Server 2003 R2 following http [://] support.microsoft.com/kb/325473. The new server has a statically configured ip(outside the scope) like the old one. Stopped the server on the old, and started up in the new server (authorized too) - but when I ipconfig /renew from a client its network interface fails with all 0.0.0.0 (or 169...*). I read somewhere I need to reconcile the scope to sync the new registry values ('ll try this tomorrow). What other troubleshooting steps can I take other than these (which didn't help)? Things work fine when the old server resurrects and the new one is taken down. The new server showed there was no requests for offer.

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• What are best monitoring tool customizable for cluster / distributed system?

  - by Adil

  I am working on a system having multiple servers. I am interested in monitoring some server specific data like CPU/memory usage, disk/filesystem usage, network traffic, system load etc. and some other my process specific data. What are available open source that can serve my purpose? If it provides to customize the parameter to be monitored and monitor your own data by creating plugin / agent. Any suggestions? I heard of Nagios, Zabbix and Pandora but not sure if they provide such interface.

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• Java SE 7?????????????????????????????????!

  - by OTN-J Master

  Java(Java Platform, Standard Edition:Java SE)????????Java SE 7??????????????????????????????????Java???????????????Java 6??????????Java 7??????????????? ?Windows ?????Java??????????? 1)http://java.com ???????2)”???Java???????”?????????”Java????????”?????3)”Java?????????”???????? ?Java 7??????????????????????Java 7????????????????????????????????????(Mac·Linux·Solaris)?????????? Java SE 7??Fork/Join?NIO?Project Coin????????????????????????????????????????????????????????1????????????????????????????Java??????????????????????Java SE 7?????????????????????????????????????? >> Java Magazine ??? ???[Vol.1] (PDF??)????????!Java 7???~?????Mark Reinhold????Java SE 7??????~ ?????Java Magazine??????????Java 7????????????????????????????????????????????????? >> Java Magazine??????????????????JDK 6?????????????·??????2013?2???????????2013?2?19???????Java SE 6?????????????????·?????????????????????????????????????????????????????????????(My Oracle Support(?·??)?????????????)2013?2???????????????Java SE 6????Oracle Technology Network?Java Archive?????????????????????????????????????????????????????????????????????????????>>Java SE?????·?????????????????????? ??????????????7??????????????????···?????????????????????????? Oracle Java SE ???????????? ?????·??????????????????????????????Oracle Java SE????(Oracle Java SE Advanced?Oracle Java SE Suite)???????????? Oracle Java SE??????????????????????????????EOL(End Of Life)????????????????????????????????????????5???????Oracle Premier Support???????????? ???????Oracle Extended Support??????????????????????????????????????????????????????????????? ???????????????????>> Oracle Java SE Advanced???? (PDF??) OTN??????????????Java???????????Java Developer Newsletter????????? ?????????”???????”?Java Magazine??????????????????????????Java?????????????????????Java??????????????Java??????????????????????????????????????????Java???????Java???????????????????????????????????????????????????????????????????????????????????????(???????!) ???2012?12?31??????????????1000????Java & Duke???????????????????????!>> ???????·????·???????

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• Force logoff of idle users on Windows 7 workstation with fast user switching enabled

  - by newmanth

  We have mission-critical Windows 7 workstations on our network that must be available to any user at any time, even when it has been locked by a prior user. Thus, we have fast user switching enabled. Unfortunately, it's not unusual for us to have a dozen or more different users logged onto the same machine at the same time, with a corresponding degradation in service. We've done our best at educating the masses to log off at the end of their shift. But users being users, this does not happen on a consistent basis. Does anyone know of a clean way to force logoff idle users after a certain amount of time has elapsed? I am open to any method that could be deployed/configured via script, GPO, or SCCM.

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• incorrect DNS entries on server 2008 r2

  - by user137841

  On the main DC (windows server 2008 R2 standard) in our network I have to clear some old DNS entries every now and then in the Forward and Reverse Lookup Zones. I have set the server Aging/Scavenging settings to Scavenge stale resource records, with both the No-refresh interval and Refresh interval to 5 days. Yet every now and then I still have to logon to the sever and remove the DNS entries for computers that is not part of the domain anymore or has been renamed ect. Is there a different way to automatically remove the old entries?

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• Are all SFP+ tranceivers usable for FEX between Nexus 5000 and Nexus 2000?

  - by Alain O'Dea

  I am looking at building a network with Nexus 5000 parent switches and Nexus 2000 fabric extenders. The mystery at the moment is what kind of SFP+ tranceivers are required for cross-connecting racks. Right now I am considering FET-10G, but I am not sure that 100m is long enough given the separation between racks is potentially very large since it is a rented rack environment. Are all SFP+ tranceivers usable for FEX between Nexus 5000 and Nexus 2000? Specifically, can SFP-10G-SR transceivers be used for longer distance FEX?

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• RDP connections keep dropping

  - by Shaul

  I have an odd problem on my notebook (HP Pavilion dv7). My Internet connection seems OK for the most part. But lately I've been having trouble with Remote Desktop connections. While I can connect to remote computers, the connection is very flaky, and usually drops after a few seconds. Sometimes it'll successfully reconnect automatically, and sometimes not. But even after successful reconnection, it'll just drop again after a few seconds. This appears to be independent of which RDP host I'm connecting to, and which network I'm connected to locally, whether wireless or wired. Other remote control apps like TeamViewer and Ammyy seem to work fine. Any ideas?

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• Resolving host names to their domain name in an internal BIND domain

  - by Adam Plumb

  I'm setting up a domain on my home network for learning purposes, using BIND on CentOS to act as the name server. I've got the name server up and running as type master for my internal domain (plumbnicoll.family), and can do forward and reverse lookups from other computers in my LAN. For example, host office2.plumbnicoll.family correctly returns office2.plumbnicoll.family has address 192.168.1.3. What I'd like is to be able to resolve just office2 to its address, without needing to put .plumbnicoll.family at the end. Is this possible, or even desirable to do? I'm running a mixed environment at home with both Linux and Windows computers.

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• Which method of SQL Server 2005 or 2008 Replication is best for ease of field changes?

  - by Rick

  We need 15 minute warm updates from one SQL Server to another. Log Shipping looks good and appears easy to setup. We are also looking into Transactional Replication. The data only needs to copy one way. We have two main requirements: 1) The destination database needs to be a max 15 minute old copy of the source. It needs to re-try and get up-to-date if a network cable is unplugged for a while. 2) We would really like table (fields added or modified) changes in the source as easy as possible. Thanks in advance for all suggestions.

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• What are my X client options for MS Windows?

  - by Nick Bolton

  I need to connect to a headless X Windows server (running on Ubuntu) from my MS Windows 7 computer over a 100 Mbit network. I could use VNC (or any other remote viewer) but the 3D graphics performance would be lousy I imagine. I used to have it hooked up to a monitor, but that's broken now and I can't afford a new one. A friend advised that I could try and use an X client, and that the 3D graphics wont suffer too much over 100 Mbit. Cygwin seems to be an option, but I was wondering if there were any more lightweight options.

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• Is it possible to have an external server within a company's firewall?

  - by Jonathan

  Hi guys, I am sure this is server admin 101, but I am unsure of the answer and would love some help. I am a software developer I have built an application for a client and am currently hosting it successfully on SliceHost. We are now coming out of Beta and the client wants to have the application within their firewall, but they do not want to deal with headache of hosting and maintaining the server. Is there a way I can recommend that we put our server at SliceHost within their Firewall? Is that an easy thing to do? Their specific requirements are: For my application to authenticate against their Active Directory, and Only allow access to the application from within their network If that is not possible, what should I recommend to my client?

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• Is Windows Server 2003 on 96 MB possible?

  - by Nifle

  I have an old laptop, a Pentium II with 96 MB. I have had Windows 2000 on it for ages, it was slow but usable. But now I have to upgrade since I can't get my USB-wlan drivers to install (the old PCMCIA network card broke). I would prefer to install Windows XP but I have no spare licence, but I do have a Windows Server 2003 licence. Do you think it's possible (and usable) to squeeze in 2003 on this computer? Edit: Unfortunately 2003 simply refuses to install on the laptop. It hangs with an error message (paraphrased) 2003 has detected a problem with your computer and has halted the installation to prevent damage. And then some error codes This happens very early in the installation while it's copying the installation files just after I accepted the licence. So I give up for now.

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• Running System Center Configuration Manager on a Domain Controller

  - by Brent D

  We are a smallish educational network (about 70 clients) with a single server running Windows Server 2008 Enterprise, functioning as both domain controller and file server. The educational pricing for Microsoft Forefront Endpoint Protection 2010 is irresistible as a managed anti-malware solution, but it requires System Center Configuration Manager 2007. I know best practice is not to run System Center Configuration Manager on a domain controller, but it's the only server I have to work with. Will installing SCCM on a domain controller cause problems? What conflicts might I need to take into account when planning deployment?

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• VPN connects but my browsers and messenger don't connect

  - by elizabeth chubbuck

  I have no problem VPN into work. As of last night, everything worked fine. But as of this A.M., none of my browsers connect and Microsoft Messenger will not connect. I did nothing, but had a pending a OSX update. I rebooted.. Still no internet. All network connections working, clearly, since VPN works. Its how I am doing this post now, is via VPN and remote desktopping to work computer. This just showed up as of this morning not working. I renewed DHCP, etc.. but cannot ping anywhere.

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• scp to remote servers stalls, unable to isolate cause

  - by Rolf

  When I copy a large file (100+mb) to a remote server using scp it slows down from 2.7 mb/s to 100 kb/s and downward and then stalls. The problem is that I can't seem to isolate the problem. I've tried 2 different remote servers, using 2 local machines (1 osx, 1 windows/cygwin), using 2 different networks/isps and 2 different scp clients. All combinations give the problem except when I copy between the two remote servers (scp). Using wireshark I could not detect any traffic volume that would congest the network (although about 7 packets/sec with NBNS requests from the osx machine). What in the world could be going on? Given the combinations I've used there doesn't seem to be any overlap in the thing that could be causing the trouble.

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• One vs. many domain user accounts in a server farm

  - by mjustin

  We are in a migration process of a group of related computers (Intranet servers, SQL, application servers of one application) to a new domain. In the past we used one domain user account for every computer (web1, web2, appserver1, appserver2, sql1, sqlbackup ...) to access central Windows resources like network shares. Every computer also has a local user account with the same name. I am not sure if this is necessary, or if it would be easier to configure and maintain to use one domain user account. Are there key advantages / disadvantages of having one single user account vs. dedicated accounts per computer for this group of background servers? If I am not wrong, one advantage besides easier administration of the user account could be that moving installed applications and services around between the computers does not require a check of the access rights anymore. (Except where IP addresses or ports are used)

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• client subscribed to a multicast group not receiving data

  - by Abruzzo Forte e Gentile

  I have a network that was setup for multicast traffic IN Machine A there is a server application generating multi-cast traffic. I have also different clients subscribing to that mulicast traffic -some client are in the same machine A -other clients are in machine B,C,D # Address I am using IP : 239.193.0.21 PORT: 20401 I don't know why but the client in machine A , even if they join the group, don't receive any data while (and this is the funny part) machine B,C and D receive everything. Checking with Wirshark I can see that the UDP traffic flow is there in Machine A. I am using LInux/Red-Hat Enterprise 6.2 What should I look at? Any setting in the os? Firewall or what?

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• Windows Server 2003 guest on Xen frequently stops responding

  - by smokris

  I'm running a Windows Server 2003 guest instance in Xen 3.x. This DomU runs fine for a day or two, then stops responding — I don't get any network response, and I can no longer connect to Xen's VNC console for this DomU. xm list shows this: Name ID Mem VCPUs State Time(s) Domain-0 0 6508 8 r----- 1161159.4 [A working Linux DomU] 1 512 1 -b---- 68711.1 [The hung Windows DomU] 5 512 1 ------ 67234.2 [Another working Linux DomU] 3 512 1 -b---- 163036.4 (What does the ------ mean? The xm manual explains what each of the six states mean, but not what no-state means.) If I xm destroy and then xm create the Windows DomU again, it boots right back up (with the Windows alert The previous system shutdown at [...] was unexpected.), and then stops responding after another day or two. I checked /var/log/xen/*.log, but no log messages are generated at the time the server stops responding. How should I proceed in troubleshooting this?

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• Only one user can connect to Ubuntu samba server

  - by StaticMethod

  I setup a samba server on 12.04 LTS, and it works great for one user but not the others. I am trying to map a network drive from a windows 7 laptop. I can successfully authenticate with one user, but the other two both get "Access is denied" errors. Here is my smb.conf file. [global] server string = %h server (Samba, Ubuntu) map to guest = Bad User obey pam restrictions = Yes pam password change = Yes passwd program = /usr/bin/passwd %u passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* . unix password sync = Yes syslog = 0 log file = /var/log/samba/log.%m max log size = 1000 dns proxy = No usershare allow guests = Yes panic action = /usr/share/samba/panic-action %d idmap config * : backend = tdb [printers] comment = All Printers path = /var/spool/samba create mask = 0700 printable = Yes print ok = Yes browseable = No [print$] comment = Printer Drivers path = /var/lib/samba/printers [share] comment = Ubuntu File Server Share path = /srv/share read only = No create mask = 0755 I know that the service is successfully reading from the /etc/passwd file because if I change the Linux password for the user that works, I have to use the new password when I connect. I changed all the users so they are all members of the same groups (all three users are admins anyway). I only ever have one user connected at a time. Here are the permissions on the shared folder /srv$ ls -l drwxrwxrwx 1 nobody nogroup 16 Feb 22 17:05 share Any ideas?

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• some websites not opening completely

  - by mkk

  Hi everybody, I am using bsnl broadband connection, modem: wa3002g1 os: xp(86x) / vista(64x) A few days back I have changed the modem (don't know the previous modem no) because of some issues. since then I am not able to open most of the websites in firefox, IE6/8, chrome, opera. If i connect with other network like reliance data card, those websites are opening, if i connect bsnl the problem will be same again. I called to customer care many times, but no use. Please help me to find the solution. Thank you in advance.

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• Home privacy when using work VPN on personal computer

  - by SavvySecretary

  Here is a question from not so computer savvy user. I have installed VPN client from my workplace on my personal home computer and use it to take brief connections to their network. Just recently I started to think, can they access my home folder and copy all the files from there? I have Windows 7 Pro. My home computer does not belong to the domain of my workplace and there is no addministrators account active on my computer, just my own. What is possible and what's not? Can't seem to find any specific answers by googling. Really awful thought they could snoop all around on my pc.

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• How to know if my nginx is in good health?

  - by Howard

  I am running a nginx on EC2 (m1.small) for SSL termination. I am using 2 workers on Ubuntu, with latest nginx (stable), the network throughput is around 2Mbps and system load average is around 2 to 3. I am wondering if this system is in good health for now, e.g. what is the queue length (I know nginx can handle a lot of concurrent request, but I mean before the request is being served, how many of them need to wait before being served) what is the average queue time for a given request to be served. I want to know because if my nginx is cpu bounded (e.g. due to SSL), I will need to upgrade to a faster instance. My current nginx status Active connections: 4076 server accepts handled requests 90664283 90664283 104117012 Reading: 525 Writing: 81 Waiting: 3470

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• Why does my excel document have 960,000 empty rows?

  - by C-dizzle

  I have an excel document, Office 2007, on a Windows 7 machine (if that part matters any, I'm not sure but just throwing it out there). It is a list of all employee phone numbers. If I need to generate a new page, I can click on page 2 and the table will automatically generate again. The problem is, someone messed it up since it's on a network drive and now shows I have over 960,000 rows of data, when I really don't! I did CTRL+END to see if any data was in the last cell, so I cleared it out, deleted that row and column, but still didn't fix it. It almost seems like it duplicates itself after the deletion. How can I fix this instead of recreating the entire document?

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• Problem accessing MICROSOFT##SSEE database (Error: 18456, Severity: 14, State: 16.)

  - by Philipp Schmid

  After an unexpected server shutdown due to a power failure, I can no longer connect to the internal windows database MICROSOFT##SSEE which is hosting Central Admin for my SBS 2008 server. The log shows: Error: 18456, Severity: 14, State: 16. Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. [CLIENT: <named pipe>] I've tried to connect using the SQL Management studio (connecting to .pipemssql$microsoft##sseesqlquery) but no luck. The SQL Server Configuration Manager doesn't show a entry for 'Protocols for MICROSOFT##SSEE' (but shows it for 2 other database hosted on the same SQL server 2005 Express edition. I have tried to restore the master.ldf and mastlog.log files from a backup, but the issue persists.

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