Upgrading to XP SP2

Two major issues:

1. Could not access SQL server on localhost. Netstat reported that the server was not listening for connections. Turned out that my server was vulnerable to Sasser, therefore XP SP2 disabled TCP/IP connectivity to the server. After installing SQL SP3a it worked again!
2. Was getting "Out of memory" error when trying to access AS/400 from the web app. All unit tests and windows apps were working. Had to change process model from "machine" to "system" in machine.config. Which made the system less secure, the exact opposite of what XP SP2 was going to do.

Conclusion: XP SP2 is too secure.