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

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2answers
852 views

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 ...
2
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3answers
652 views

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 ...
0
votes
1answer
225 views

How can I troubleshoot error 10049?

We have an multi-tier application that lets our clients connect through the internet to us and have run into an interesting problem recently. From some client locations, User A will attempt to ...
3
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5answers
505 views

Tracking down load average

The "load average" on a *nix machine is the "average length of the run queue", or in other words, the average number of processes that are doing something (or waiting to do something). While the ...
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4answers
2k views

>40Hz DNS query xxx.1.168.192.in-addr.arpa, unknown cause

On one of my FC10 boxes I noticed that the network activity lights keep flashing even when I'm doing nothing on it so I pulled out wireshark and took a look at whats causing it. It's logging the same ...
2
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3answers
3k views

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 ...
2
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2answers
7k views

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 ...
0
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2answers
553 views

gltail “Missing gem net-ssh”

I'm attempting to get gltail set up on my local system to monitor logs remotely. I've got all the dependencies installed, but when I go to run gltail ... ./gl_tail configfile ../config.yaml I get ...
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10answers
2k views

Etiquette of Troubleshooting Problems In The Workspaces Of Others

A visibly upset colleague approached our technical support team this morning. She noted a member of our team had changed her workspace: Her monitor was turned off (she expected standby mode). Her ...
3
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7answers
632 views

Wireless network signal strength troubleshooting… where to start?

Here is the information displayed by the wireless router (see end of post). The problem is that my netbook does not get any signals from the router if moved more than 3 feet (yup, three feet) away ...
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2answers
3k views

VMWare workstation 6.5 bridged networking stopped working

I have an XP client running on a Vista host. The client used to have bridged networking working fine, lately it stopped working for no aperant reason. Other kinds of networking works, though. It ...
1
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3answers
2k views

On Windows Server 2008, how to troubleshoot IIS hang when CPU, Disk IO are normal?

Can someone recommend a good strategy for troubleshooting IIS that is hanging on Windows 2008? Normally, I check the following in Process Explorer: CPU Disk I/O Context Switch Delta However, in ...
76
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9answers
38k views

Environment variables of a running process on Unix?

This is to troubleshoot some problems related to environment variables .. On Windows, I could do this by using tool such as ProcessExplorer to select particular process and view values of each ...
2
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4answers
2k views

How Do I Debug An IMAP Problem?

I am setting up an email server with Postfix and Dovecot. Remote email clients can read email, but cannot reply to it or send new messages. (Email clients local to the server receive and send email ...
3
votes
4answers
4k views

How to diagnose a hang when creating a new folder in explorer.exe

I have been having some issues with explorer.exe hanging when I create a new folder. If I use Analyse Wait Chain in the Resource Monitor it says "One or more threads of explorer.exe are waiting to ...
1
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1answer
176 views

How do I Interpret a Failed Request Trace?

I have a problem with a web site running IIS 7. The problem are the initial requests to each page: they take far longer than they should. After that first request the page loads fine. I'm sure the ...
0
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6answers
975 views

Whence for Windows?

I'm trying to determine the location of an executable (java.exe) on Windows. I know it must exist somewhere in the PATH since I can run it, but I don't know the exact directory that it is being run ...
2
votes
2answers
1k views

Losing 1/3 of my download speed with my new router, any ideas on how to fix?

This is a cross post from superuser.com since no one over there seems to know anything. I recently replaced a dying D-Link router (DI-524) with a Cisco/Linksys RSV4000. I'm really happy with the ...
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5answers
412 views

Is it realistic to remotely troubleshoot network issues?

I have a small non-profit that I help that has a hub and spoke fiber network on managed Netgear switches. They have both T1 & DSL connectivity, separated by VLAN's with a simple VoIP system ...
2
votes
1answer
2k views

High Hardware Interrupt level on Windows Server 2003 (VM)

I have a rather loaded Windows 2003 server. It's mainly loaded with IIS instances (about 6 or 7 w3wp processes) and some sharepoint stuff. The machine was P2V-ed from a real host and now resides on a ...
3
votes
3answers
4k views

Exim taking long time to send emails, how to decrease delay in Exim service?

The linux server where exim service is running is under no load. The system is sending email successfully but is taking a long time to send each email. Basically if I telnet to localhost port 25 ...
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5answers
1k views

What is the root cause of a Hard Drive “ticking” sound after 15 min of being on?

In my office there is a laptop dell inspiron 1420 with HD of 100GB of space. The computer is about a year old, and the hard drive has a weird and annoying ticking sound. The ticking sound starts ...
2
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5answers
552 views

Troubleshooting seemingly random G4 kernel panics and lockups

Recently my 9 year old Apple G4 file server has been randomly crashing. Often it's a kernel panic, but sometimes the system just locks up. It seems almost always to happen when I'm out of my office... ...
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2answers
1k views

How to troubleshoot a hanging process in Windows?

I've been having the same problem with several applications lately -- I start them and they just hang. I don't see anything on the screen, however the application is listed in Task Manager and its CPU ...
2
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2answers
242 views

What are the most important skill/knowldege sets for a network administrator to have to support VOIP?

As a network administrator (Cisco switches, work with WAN providers, protocol analysis) I have an "area of responsibility" for the customer's VOIP project. The telecom group has primary ...
0
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1answer
154 views

FTP connection hanging on 200 Welcome to blabla FTP services

I am having problems when connecting to a remote ftp server that is running on UNIX.When I try to coonect it freezes on the welcome screen and it dos=esnt prompt for password and username. Connected ...
2
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1answer
4k views

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 ...
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1answer
680 views

linux heartbeat losing packets

I am using linux heartbeat to keep ldirectord running on my webservers. My logs show heartbeat WARN: 1 lost packet(s) every couple of minutes, and I'm having trouble figuring out why. I have tried ...
0
votes
1answer
1k views

Postfix Mail Filter Stops Delivering Mail

I have an internet facing postfix mail filter (debian lenny) that sits in front of all our other mailservers on our network, and scans our mail using amavisd-new, clamav, spamassassin, and ...
0
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2answers
1k views

Supermicro X8DT3-LN4F Troubleshooting

yesterday I built up a new system containing a Supermicro X8DT3-LN4F mainboard and an Intel Core i7-920 CPU with 2x2 GB DDR3 RAM. Each time I power it on, the fans begin to work but I won't get any ...
0
votes
2answers
823 views

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: ...
2
votes
1answer
179 views

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 ...
0
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2answers
3k views

Can't connect to port 80 in Ubuntu Desktop or Server 9.04 in VMWare Workstation 6.52

After a brand-new install of Ubuntu 9.04 Desktop or Server into a VMWare Workstation 6.52 Virtual Machine, I am unable to connect to port 80 on any remote site (google.com, etc). I can ping remote ...
4
votes
5answers
3k views

How to translate error number to 'errno' constant?

Suppose I have an application running on a UNIX box that is failing with a system error status of '13'. Now, I can easily look up this value in errno.h, to find out that it is a permission-denied ...
0
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9answers
2k views

HP Tx1000 laptop : no LCD panel or HDD activity

A HP TX1000 Series laptop PC is unresponsive to the power-on event. What was a previously working machine, the LCD display panel suddenly switched off while the machine was in normal operation. When ...
0
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6answers
759 views

Debugging Cisco 2621 Routers

I've recently noticed problems with my 2621 router - it becomes unresponsive for about 10 minutes at a time, about 10 times a month. The router sits inbetween the outside world and servers which I ...
3
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3answers
3k views

How to troubleshoot events in the Windows Event Logs?

How do you troubleshoot events that are not clear when you read them? Is there a website to search for those Event IDs and errors? In the following example event it is clear that the gateway ...
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1answer
1k views

Apache Tomcat Servlet 404 Troubleshooting

I maintain a GWT web application that uses 3 java servlets for file download/upload and data transfer. I had my servlet mapping sin place and have not touched them in months, just a few days ago I ...
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5answers
690 views

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 ...
2
votes
1answer
688 views

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 ...
0
votes
1answer
4k views

How to temporarily disable a Cisco IPS module for troubleshooting

I have a Cisco IPS module running in my ASA 5510 firewall. Right now I'm trying to troubleshoot a network/VPN problem that two of my users are having when they VPN into a remote partners site. I ...
0
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4answers
126 views

Windows Network Connection has filled systray with many icons

I have a user that has a crazy amount of network connections populating his systray and he only has one network card and a wireless card. After a while he can hover over them and they will ...
3
votes
12answers
7k views

Citrix degrades with 100% CPU

We have a Citrix PS4.0 farm made up of 2 physical and 2 virtual Citrix servers. Any one of them at some point or another will eventually degrade in performance due to hitting 100% CPU usage. I can ...
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3answers
1k views

Troubleshooting tips for USMT?

We have a large Vista migration underway and are using USMT (User State Migration Tool) to grab profiles in preparation for the push, which has resulted in some problems. The majority of the captures ...
0
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6answers
3k views

How to troubleshoot a black screen (no video) on boot?

On a related question to this one, now I have a file server whose power supply and fans spin up, but gets no video and no beep codes. I have tried two different video cards in the system, and neither ...
3
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5answers
9k views

How can I install Windows 7 without burning a DVD or using a USB Drive? [closed]

I downloaded the .iso of Windows 7 and would now like to install it as my main OS. However I can't because I don't have a DVD Burner, a 2+ GB USB Drive, or a external HDD (or extra HDD). So how can I ...
3
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5answers
2k views

How can I troubleshoot a broken on/off switch?

I have a file server that was recently relocated in a transoceanic move. It isn't under warranty, as it was a custom-built in-house tower. When I hooked everything up and tried to boot it, the system ...
4
votes
7answers
559 views

General tips for interpreting error logs [closed]

Reading log files can be pretty frustrating as, by nature, their content says as much about the developer who penned them as the problem itself. Do you have any general purpose tips for interpreting ...
4
votes
2answers
456 views

Troubleshooting apache redirects in production

How do you troubleshoot Apache redirects in production? I know there's a logging feature somewhere that lets you log all the redirects that happen...
2
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3answers
2k views

Email delivery is slow between us and counterparty. What can I do to determine root cause?

Emails between us and a specific counterparty are delayed. To give you some idea, we send 10 messages and over 40% arrive with a 20 (or greater) minute delay. We even had two messages arrive in 50 ...