ASP.Net when post back get The specified URL cannot be found

Question

When clicking the save button on a asp.net web form page, I get the following immediately:

The specified URL cannot be found

This does not happen when I try this using a browser on the web server.

Has anyone run across this problem before? Is this some kind of security issue?

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More information. I tried a test page that included all of the form fields and a button that didn't do anything but write to a log4net log. Same problem on the button click. This is just weird.

Answer 1

Found the solution to this!!! Turns out the firewall was blocking request that had more then 40 parameters in the query string.