If you try to start or restart the World Wide Web Publishing Service on a Windows Server 2003 system with IIS 6 and you get this error, here is the fix for it.

"Could not start the World Wide Web Publishing Service service on Local Computer.

Error 1363: Cannot start a new logon session with an ID that is already in use."

Open a command prompt and type this command:

regsvr32 qmgr.dll

Now reboot the server and the problem is fixed. In our case, this happened after virtualizing a server and using a different NIC after it had been virtualized.