Cross-posted from http://blogs.msdn.com/webtopics One of my customers had a problem on his IIS server, where the IIS process hosting his web application was suffering from very high memory utilization over time. Eventually the process got so...

A problem was seen where Internet Explorer clients would reset the TCP connection between them and the IIS server when they received an HTTP 200 response for static content from IIS. The problem manifests itself to end users as slow performance of the...

After sending an HTTP request to IIS, an Internet Explorer client displayed the following error message to the user: Bad Request Beginning in IIS 6.0, “Bad Request” errors are almost always returned by HTTP.sys, so the next step was to...

In this scenario, HTTP requests were being sent from a non-Windows machine and were being responded to with a “Bad Request – Invalid Hostname” error by the IIS server. Beginning in IIS 6.0, “Bad Request” errors are almost always returned by HTTP.sys,...

When hosting an ASP.net web application on IIS7, and you have the application running in integrated pipeline mode, you may find that users complain that the application performs slowly. This may occur if your website is busy, handling 12 or more requests...

Thanks to Robert Patrick for submitting these issues There have been some issues recently where users complain of SSL connections suddenly no longer working with IIS7. Users can connect to IIS7 websites over http://, but browsing to https://...

The maximum number of Application Pools that IIS 6 can host depends on a few different things, including (but not necessarily restricted to) the type(s) of content being served, the number of application pool running concurrently, and the identities of...

Cross-posted from http://blogs.msdn.com/webtopics 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...

Cross-posted from http://blogs.msdn.com/webtopics Questions often arise pertaining to what the Time-Taken and Time fields are reporting in the IIS logs. The Time field is quite straightforward: it specifies when the log entry was created....

== Cross-posted from http://blogs.msdn.com/webtopics == 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...

== Cross-posted from http://blogs.msdn.com/webtopics == The purpose of this blog post is to review the concept of SQL Injection attacks, to introduce URLScan 3.0, and to discuss how to configure URLScan 3.0 to block a SQL Injection attack that uses...

In Part 1 of this topic, I explained how to gather the correct data to help diagnose performance issues in IIS web applications that have associated high CPU behavior. To summarize, we need a performance monitor log with the %ProcessorTime data for the...

One of the types of performance problems that can occur with IIS web applications is when the process hosting the web application (in IIS6 in Worker Process Isolation Mode it is w3wp.exe) spins up the CPU utilization of the server. Usually this is associated...

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...