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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.

357 questions
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Troubleshooting Amazon EC2 reboot

We've had a server (CentOS) running in EC2 for a few months. It had been going pretty smoothly until today when we got an alarm that the server was unavailable (HTTP service couldn't be reached). So I tried SSHing into the box but that timed out as…
ahanson
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Server Performance Issue - Server 2008, SQL 2008 and Hyper-V [screenshots]

Im getting nasty performance on my server. It happens radmonly while accessing a website, but more often, right on the first time I load it. The server/webapp are still in dev, so I'm the only one accessing it. Specifically, timeout expired error.…
Shane
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Can ping machine by IP but not by name

On my home network, connected by means of a LinkSYS WCG200 Wireless-G Cable Gateway and a Unicom switch I have several computers. One of these is an XP Home machine that I can ping by IP but not by name. Also from this machine I can ping other…
Guy
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How to determine SQL causing Oracle CPU Spikes

I have a J2EE Spring/Hibernate webapp using Oracle 11g for persistence, occasionally in production the Oracle CPU spikes to 100% usage, restarting Tomcat drops the Oracle CPU. I am unable to replicate this in test, even using an export from…
BZ.
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Can someone see why my DNS won't work? I followed everything in the tutorial, but won't work

If anyone can help me troubleshoot this, I would very much appreciate it!! The tests work. It's just that when I do the manual ping/nslookup test, nothing is working. By the way, I followed everything in this tutorial. This is my…
Alex
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how to debug/troubleshoot collectd?

I have an issue with custom script using exec plugin. From shell the script works well and nothing useful in /var/log/collectd.log. LoadPlugin logfile LogLevel info File "/var/log/collectd.log" Timestamp…
Putnik
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Diagnosing system which persistently recognises SATA drives but refusing to recognise SAS drive or its replacement?

I've done a fair bit of troubleshooting but I'm completely at a loss what could be going on. Hardware / platform Supermicro X10SRi-F motherboard EVGA 850W G2 PSU (one of the highest rated for power quality at Jonnyguru.com) 128GB Crucial DDR4…
Stilez
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Testing VPN from same network I want to VPN into

This is a general question. I'm building a VPN for my work network on a Juniper SRX firewall, and I need to troubleshoot it. Right now, I have to walk to a cafe or library to test it and then go back into my office to change the configuration. This…
Michael
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Is there any way to tell what is causing an application to lock up?

This happens on a number of PCs (WinXP SP3), where an application will simply lock up. It may be the browser (usually Firefox in our case) or it may be Visual Studio, or something else, but every time it seems the same, the application locks up,…
Glenn Slaven
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How to troubleshoot a web server?

NOTE: This is being asked, not because it is a good question (in my personal opinion, it's not), but because I've noticed a lot of questions on here boil down to this question, and since I'm sick of downvoting and giving a form response in a comment…
Parthian Shot
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Website inaccessible until host is pinged from client (on a class A subnet)

There is this really weird issue on the internal network, this happens constantly to "random" machines. Machine (client) boots up, goes to some-intern-website-which-is-not-accessible-from-internet.company-name.tld, timeout, retry, timeout, ping the…
Gizmo
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Bind9 recursive queries have intermittent very long response times

I'm running BIND 9.8.1-P1 caching server on Ubuntu 12.04 LTS on kernel 3.2.0-86-generic-pae. I've been banging my head against the wall trying to figure this out for weeks and I just have no idea what is going on and am having a hard time even…
Brian LaPan
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80% memory utilization on server- is this just caching?

Memory utilization is very high on this 2008 R2 server, but I think it might just be caching RAM- performance on the server is fine and CPU utilization is very low. It is running DFSR which I believe claims a lot of RAM. So here is what I see in…
red888
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iostat taking lot of time to return

I have a solaris 10 server with a lot of SAN disks (close to 1000 across all paths). iostat -En takes close to 5 min to return. Is there a way to figure out what is causing the delay? truss hasn't helped much.
sai garimella
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Linux RPC delete registration

there is a well-worked program (daemon) running on CentOS-5.4 that makes by itself RPC registration as program 191299 version 10. After an unplanned program stop, the RPC registration is still remaining, so the program can't get restarted due to…
user2606627
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