A recent security update “Microsoft
Security Bulletin MS11-100 - Critical” from Microsoft made our asp.net application (some pages)
to crash which is hosted on IIS Server running on Windows Server
2008.
Following are the error messages from the log:
1. Operation
is not valid due to the current state of the object.
2. The
URL-encoded form data is not valid.
The two strange error messages made me busy for the next half an hour. After some research I came to know that the server had undergone a critical security update. Though, it is common for the server to auto update windows features.. this time there was a critical security update which involves all versions of .Net framework.
We tried to add new appSetting Key/Value in web config
file to fix the issue.
<add key="aspnet:MaxHttpCollectionKeys" value="2001"/>
MS Windows auto update feature is good which keeps your system up to date. However, the latest security update created a technical glitch.
