HTTP Error 404.15 – Not FoundThe request filtering module is configured to deny a request where the query string is too long. Exception type: CrmSecurityException Exception message: Could not find GUID for : server$ with...

Hi,

Recently got the above error while trying to open the CRM web application. It was because the password for the account which was being used to run CRM services and CRM App Pool was recently changed.

Have a look at this article as well.

http://www.kevinholland.net/professional/crm/crm-4-0-update-rollup-18-gotcha

Bye.