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

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3answers
79 views

The network routes A.com and sub.A.com so differently

Route is based on IP, right? How does it possible to route my packets so differently? One is success, but another is not. # traceroute A.com traceroute to A.com (1.2.3.4), 30 hops max, 60 byte ...
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3answers
3k views

Computer only starts on Last known good configuration

My computer restarts everytime the login dialog is about to appear. It only loads fine on 'Last known good configuration' option What steps should I follow to debug this issue? OS: Windows Server ...
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2answers
92 views

http server connectivity puzzle

I have been seeing some strange connection issue in the production environment. The setup has two IBM Http Server's (IHS) and a network IP load-balancer in front of them (round-robin). One instance ...
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2answers
360 views

Better approach for diagnose web server failure

Yesterday my web sites were down for a short time. I logged on my server and my first reaction was restart the apache web server. After that everything was working fine. So I start to check the ...
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7answers
776 views

Good tools and approaches for diagnosing poor performance

My company is developing a web-based data viewer application which requires a fairly decent amount of bandwidth to function well. However recently we have been changing a lot of things. For example, ...
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8answers
6k views

creating decision tree based troubleshooting documentation?

We troubleshoot a lot of server and network issues and follow a loose set of steps on what to do in different cases. With more and more people and responsibility, the need for standardization is ...
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1answer
478 views

ISA Server: How to troubleshoot DHCP problem?

I've added a DHCP Server to my ISA Server. The purpose of the DHCP server is to provide addresses to a DMZ (on its own interface) for misc computers that need internet access but don't need to be part ...
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6answers
29k views

Why was my ping answered by a different IP address than the one pinged?

While trying to setup a MSSQL clustering solution, I am running into a problem that is outside of my expertise that is related to networking. I was trying to find a free IP to used for my node. I ...
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3answers
6k views

Trouble setting up a DD-WRT router with a DSL gateway

Our office is fairly small. We previously had a 2wire gateway that came when we ordered our DSL connection. I recently decided to upgrade to a router that could support DD-WRT since the 2wire was very ...
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2answers
3k views

remote connections and mysql on ubuntu?

I have Ubuntu running in VMWare. I installed mysql 5 server and comment out bind-address and restarted the mysql server. I am now trying to connect to mysql but i cannot. I tried using 1) Code and 2) ...
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4answers
259 views

Diagnose Network Faults

Disclaimer: I am a developer, not a system admin, please be gentle. Where I work we are having a lot of intermittent network problems. Sometimes the DNS will fail, but access to servers can be done ...
2
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2answers
883 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 ...
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3answers
686 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 ...
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1answer
241 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 ...
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5answers
545 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 ...
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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 ...
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2answers
8k 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 ...
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2answers
576 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
3k 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 ...
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7answers
640 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 ...
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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 ...
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9answers
49k 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 ...
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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 ...
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4answers
5k 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 ...
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1answer
184 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 ...
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6answers
1k 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 ...
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2answers
2k 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
465 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
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1answer
3k 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 ...
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3answers
5k 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
2k 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 ...
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5answers
562 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
249 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 ...
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1answer
160 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
766 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 ...
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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 ...
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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 ...
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2answers
950 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
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1answer
180 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 ...
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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 ...
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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 ...
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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 ...
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6answers
797 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 ...
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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
701 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 ...