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Investigating Locks

Consider the following scenario: You have an ASP.NET application which intermittently responds sluggishly. As the problem occurs memory usage is about average, as is CPU usage, but still certain pages respond slower and slower. The machine acts just as Read More...
Posted Friday, October 09, 2009 3:49 PM by JohanS | 2 Comments

Office Automation

A very common scenario that keeps sprouting new heads like a hydra is Office Automation. Let me start by saying that this is not supported. There is a KB-article number 257757 discusses this, and clearly states the following: Microsoft does not currently Read More...
Posted Tuesday, October 14, 2008 3:15 PM by JohanS | 0 Comments
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Why doesn’t the GC kick in when the worker process is inactive?

I got the following question in my Getting started with windbg – post and I thought it might be worth posting the replies in a separate article: Hi Johan, about those threads with an ID of XXXX, should they go away after certain amount of idle time like Read More...
Posted Tuesday, May 13, 2008 3:39 PM by JohanS | 1 Comments

What to do about the slow startup of web services

Due to the architecture of web services and web applications they can be quite slow to start. For example on my Windows 2003-box the initial localhost-call to a simple “Hello World!”-web service takes approximately 8 seconds, while the next request is Read More...
Posted Wednesday, April 02, 2008 5:05 PM by JohanS | 3 Comments

Using IE6 With Visual Studio 2008

Here's a little scenario I came across the other day. I've forwarded the information to development, so it's pending further investigation. I still thought it would be a good idea to publish the scenario though. Visual Studio 2008 + FTP = Possible trouble Read More...
Posted Wednesday, March 26, 2008 6:04 PM by JohanS | 5 Comments
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Monitoring Application Pool and Application Restarts

This morning I found the following in my inbox: I had set my web servers running on IIS 6 to recycle if they hit 700 MB (Maximum used Memory). Can I run a report to know how many times per day or week the W3WP got recycled. Any suggestions please. Thanks Read More...
Posted Monday, February 18, 2008 3:12 PM by JohanS | 3 Comments

Did you know? - Changing ASP.NET Version restarts IIS

Here's a little something I learned the other day. If you go to the ASP.NET tab and change the ASP.NET version for an application pool this will not only reset the application pool, but the entire IIS. I was a bit surprised at first, but investigating Read More...
Posted Tuesday, February 05, 2008 1:09 PM by JohanS | 3 Comments

Debugging School

As you may or may not have noticed I've started organizing all posts I've made regarding debugging training in a separate list on the left hand side of the page. If you're new to debugging and don't know where to begin, then at least you know where I'd Read More...
Posted Friday, February 01, 2008 3:44 PM by JohanS | 0 Comments
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Using WinDbg - Hunting Exceptions

Prerequisites This post will require some basic knowledge of windbg and the sos extension. For this I recommend looking at the following posts: Getting started with WinDbg - Part I Getting started with WinDbg - Part II For more information on Exceptions Read More...
Posted Thursday, January 31, 2008 5:39 PM by JohanS | 7 Comments

Implicit casting in DataRepeater not working in certain scenarios after SP1

Problem Using the following VB-syntax in a DataRepeater will no longer work after applying .NET Framework 2.0 Service Pack 1 in a medium-trust environment. <asp:Repeater ID="Repeater1" runat="server"> <ItemTemplate> <%#Container.DataItem("data")%><br Read More...
Posted Wednesday, January 30, 2008 1:21 PM by JohanS | 2 Comments
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Using WinDbg - Advanced commands

Did you know you can build your own advanced commands using for each, if, etc? The complete list of control tokens are: .if .else .elseif .foreach .for .while .do .break .continue .catch .leave .printf .block Using these command tokes you can send quite Read More...
Posted Wednesday, January 23, 2008 3:46 PM by JohanS | 8 Comments

Exceptions

Introduction This was originally intended to be a post on identifying and troubleshooting Exceptions using windbg. As I started writing I thought I should write a little something about exceptions in general, just to begin the post. That little something Read More...
Posted Friday, January 18, 2008 4:50 PM by JohanS | 3 Comments

Aspnet_state.exe crashing on Xp

I ran across an interesting situation with a customer today. He had a workstation running Windows Xp Professional. He'd previously been running Framework 1.1 and had been using the ASP.NET State Service. He had now upgraded to framework 2.0. and upon Read More...
Posted Friday, December 21, 2007 4:35 PM by JohanS | 2 Comments
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Lot's of objects on the Large Object Heap on a 64-bit server

My colleague Tess showed me a dump today which I thought was really interesting. The scenario was as follows: - We have a web application that's been running successfully on a 32-bit server for quite some time. We've now moved to a 64-bit server. The Read More...
Posted Friday, December 14, 2007 3:31 PM by JohanS | 1 Comments
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Getting started with windbg - part II

This is a continuation of my previous post with the imaginative name Getting started with windbg - part I . I'll be assuming that you've read it, so if you haven't I suggest you check it out first. We're still working with the same sample dump, so I'll Read More...
Posted Monday, November 26, 2007 2:49 PM by JohanS | 12 Comments
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