I recently helped a customer with an issue where ASP pages would not execute and returned the following error page: HTTP Error 500.0 - Internal Server Error If you check the Detailed Error page you will see the following additional information (NOTE: Steps to enable and use Detailed Errors can...

Recently, I came across an issue where the customer faced an FIPS (Federal Information Processing Standards) related error on the .aspx pages which had debug=”true”. His ASP.net application was hosted on IIS7 running on Windows Server 2008 SP2. And, he was able to reproduce the issue using a very simple...

Last week I posted the following blog which showed how to use Process Monitor to troubleshoot service startup issues. http://blogs.msdn.com/webtopics/archive/2009/06/16/troubleshooting-service-startup-issues-with-process-monitor.aspx To continue on that topic, I ran across another issue recently...

Many things can cause a service, like IIS’s World Wide Web Publishing Service, to fail on startup. When troubleshooting such an issue, Process Monitor can be an invaluable tool. What Process Monitor does is monitor all File and Registry access on the system in real-time. The latest version of process...

The following article is an excellent reference when trying to figure out how to set SPN’s for your IIS Site. http://support.microsoft.com/kb/929650 I wanted to focus on the SPN helper script in the article, and how it can be used in a very simple way when setting your own SPN’s, to avoid the common...

This is just a quick blog to mention a forgotten tool. The managed stack explorer can be run on an IIS 6.0 Server running ASP.NET 2.0 to investigate the managed call stacks. Looking at the call stacks when an ASP.NET application is not responding may help identify what the requests are doing. Setting...

Cross-posted from http://blogs.msdn.com/mike Enabling HTTP Compression for your IIS6 web applications is one way of increasing site performance. One of the more common problems I see when helping customers with compression is that their IIS servers are not set up for compression correctly. Unfortunately...

Few days’ back one funny issue came to me.   All of a sudden on one of the Windows 2003 server my customer was getting “HTTP/1.1 500 Server Error” for any .asp pages in the application. It stopped working since last couple days and used to work earlier. So here the obvious question would be - What...

Most people on installing .NET 3.5 on the server "expect" an entry for  v3.5 under the ASP.NET version Tab in IIS manager. And not finding that entry start panicking. If you have been one of those read on. The more tech savvy folks try to run aspnet_regiis -i from the v3.5 framework folder...

After sending an HTTP request to an IIS server, an HTTP client (such as Internet Explorer) may display the following type of error message in the browser window: If Internet Explorer’s Friendly HTTP Error Messages option is turned off, the error may resemble the following: ...

Introduction The purpose of this blog post is to discuss how to mask an IIS server’s IP address from being sent as part of an HTTP response. By default, IIS can send a server’s IP address in the Content-Location or Location response headers of a response. Beginning in Windows 2003 SP1, you can configure...

Special thanks to Sean Everhart for contributing this topic Internet Explorer 8.0 introduces a new method of interpreting and displaying the HTML data sent from web servers. In some cases, this can result in the web pages being displayed to users incorrectly. For example the pages may display with...