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Debugging an IIS / SharePoint performance issue using WinDBG

Posted Tuesday, June 30, 2009 9:19 PM by Ken
After a recent SharePoint 2007 migration exercise at a large customer, we started experiencing performance issues reported by end users when the system was under load. In the Windows Event Logs we saw the following event: Event Type: Warning Event Source: Read More...
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Causes, and tips for debugging, a STOP 0x0000000A (IRQL_NOT_LESS_OR_EQUAL) bugcheck/blue screen - Part 3

Posted Tuesday, January 9, 2007 9:32 PM by Ken
Sometimes when looking at your dump files, the actual cause isn't possible to determine due to issues such as memory corruption. For example a buggy module may write to some memory address that it doesn't own. When the real owner comes to read Read More...
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Causes, and tips for debugging, a STOP 0x0000000A (IRQL_NOT_LESS_OR_EQUAL) bugcheck/blue screen - Part 2

Posted Tuesday, October 3, 2006 10:18 PM by Ken
Update: I have now added Part 3 - where I cover enabling the Driver Verifier tool. This can be handy if you are getting STOP 0xA crashes, but the faulting stack is different/corrupt each time. Update 2: If you are getting random STOP numbers each time Read More...
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Causes, and tips for debugging, a STOP 0x0000000A (IRQL_NOT_LESS_OR_EQUAL) bugcheck/blue screen - Part 1

Posted Sunday, October 1, 2006 10:09 PM by Ken
A STOP 0x0000000A (IRQL_NOT_LESS_OR_EQUAL) bugcheck is one of the most common STOP codes encountered by users today. After discussing this with my former colleague Chewy on my way to Tech.Ed SEA, I've decided to write up a post briefly explaining Read More...
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Access Violation - must be mouse drivers!

Posted Saturday, August 5, 2006 4:23 AM by Ken
Seen on bash.org - made my laugh Coke out my nose. does anyone waht error: 0x1d1c4e86 referenced memory at 0x0000000000 the memory could not be read mean? :D yes what does it mean ? i only get it when i'm browsing the harddrives someone forgot to Read More...
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Two easy (easier?) ways to determine Kerberos from NTLM in a HTTP capture

Posted Wednesday, August 2, 2006 7:49 AM by Ken
Tristan's got a post explaining how to determine whether your client's using NTLM or Kerberos when authenticating to your web application. Is there a better way than looking at the size of the request? I think so (but that's just my opinion). Read More...
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Is IIS causing Windows to crash? WinDBG to the rescue!

Posted Thursday, July 20, 2006 8:07 AM by Ken
There are a few good resources out there for troubleshoting crash/hang situations in Windows. Some of the resources I regularly look to include: Tess's Blog Raymond Chen's Blog David Wang's blog Windows Internals (by Mark Russinovich and David Read More...
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Using PoolMon (Pool Monitor) to debug kernel memory leaks

Posted Monday, July 10, 2006 9:14 AM by Ken
I've been assisting someone with a memory leak issue over the past few days. They described their symptoms as: The server will suddenly stop accepting any form of request from other servers. If you try to do a snap-in from another server using MMC, Read More...
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