Tamino and Web Server Management


I have a strange problem. I have Tamino version, hotfix 528.
It runs on IIS 6 on XP. I have installed a database ans it runs fine.
I wanted to enhence the security by installing a web server client on localhost, but as soon as I do a request to the database, the database stops. Is this a bug? How shall I manage this?

Please raise a support request for this.