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Questions tagged [troubleshooting]

Troubleshooting is a form of problem solving, often applied to repair failed products or processes.

It is a logical, systematic search for the source of a problem so that it can be solved, and so the product or process can be made operational again. Troubleshooting is needed to develop and maintain complex systems where the symptoms of a problem can have many possible causes.

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clocksource tsc unstable

Ok, now I have real server fault ;) After some time from booting (about one minute) my server hangs. All I can do is hard reset. Then after restart in /var/log/kern.log I can find: Jul 29 22:38:57 leonidas kernel: [ 90.729598] longhaul: Failed to…
amorfis
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IBM Xseries 3400 only working while power button holding pressed

I have an IBM xSeries x3400 Intel Xeon server which only works while someone holds in the power button. My server stopped working and I sent it to IBM Service. After a few hours they told me I could backup my data. When I asked how they managed to…
adopilot
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Measure Upload Speed between a client and our server

We host a SAAS application specially customized for multiple clients. For one customer in particular -- they are reporting sporadic performance issues from various locations on their network, in particular UPLOADING documents through a form on our…
tresstylez
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How can I troubleshoot an immediate computer shutdown?

I've had my desktop for ~4 years now, and recently it started behaving really badly: Whenever I run a Flash webgame or anything that takes up a great deal of memory - like a game, for example - everything will work fine for awhile, but after 10-15…
Runcible
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Why is my system constantly downloading from 255.255.255.255:bootps?

On my workstation I noticed that my network utilization is high and constant even though I don't have any downloads currently going. I fire up iftop and see the following entry at the top: 255.255.255.255:bootps => * :bootpc …
Mike Mazur
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BIND server cannot resolve us3.php.net!

My caching nameserver (BIND 9.3.6-P1) cannot contact 216.194.113.11 or 216.194.113.12 over UDP port 53 for some unknown reason. This prevents anyone at my office from resolving names such as phpnet-mirror.tierfour.com. However our nameserver…
Josh
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When troubleshooting a complex issue is there a reason to go with an additive vs subtractive troubleshooting methodology

TLDR: I am interested in finding out whether there is a reason to select an additive approach to troubleshooting over a subtractive approach, or vice-versa when trying to troubleshoot a problem with many variables. Problem overview: I am working…
Shane Wealti
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my ssh sessions are randomly killed on Debian

I have a Debian 6.0.1 vanilla install, and I use PUTTY to ssh into it. I will usually have 3 or 4 PUTTY login shells running at the same time. What I'll find is that if I leave my computer for a couple of hours, I'll find that 1 out of 4 shells…
kjackson
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Trouble shooting wireless signal performance

I just performed a wireless network scan and my primary wireless route broadcasts a consist 70 DBm signal. I added a range extender that increases or decreases the signal 65 DB (Not sure how the DB m scale works) Is this considered a poor signal? …
Michael Kniskern
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IIS logging troubleshooting

We've got an IIS server that hosts about a dozen small websites. A couple of the websites do not log activity. We've gone into the IIS Admin console and each website is configured to log daily into Drive:\logs\w3svcXXXX\ where XXXX is the…
BillN
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Random Ubuntu server network disconnects

After installing Ubuntu Server 10.04.1 on a new x86_64 kvm instance (Debian 6.0 hosted) I'm getting -apparently- ramdon disconnects from the server. Read from remote host myserver: Connection reset by peer Connection to myserver closed All TCP…
scetoaux
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Resources on Java for Sys Admins?

I've been fortunate enough to make it four years as an SA without having to administer systems making use of Java. My luck has run up and I am starting a new job and they make extensive use of Java. What resources are available for a SA who needs to…
CarpeNoctem
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My Ubuntu 10.04 server kills all WAN bandwidth when it's attached to my LAN. Where do you begin troubleshooting?

First I should say that my Linux knowledge is minimal; just enough to set up some servers (Apache, Tomcat, Couch, etc). I built a MiniITX server to host some simple sites, act as an SSH tunnel while I'm away, and act as a torrent server. It was not…
rcampbell
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VPN troubleshooting

I have a user that is having trouble VPN to the office. What are you top troubleshooting things to try to find out where the problem is. The error the user is getting is Error 806 - a connection between your computer and the VPN server has been…
Simon Foster
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blat.exe getting deleted from my servers

we're using blat.exe as part of many of our setups on Windows Server 2003 SP2 without any problem to send mails via command line. It's simply great. Now, some software we are using provides blat.exe as part of their installation. The problem: from…
hensley
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