A Vista OPC client on a Windows 2008 server is not getting a OPC server on a XP online.

Issue

A Vista OPC client on a Windows 2008 server is not getting a OPC server on a XP online.
It is possible to browse the OPC server and read values with OPC tool but it is not possible to get it online in Vista.

Product Line

TAC Vista

Environment

Vista 5.1.6
Windows 2008
Windows XP

Cause

Not sure why but after have checked the DCOM settings over and over again we found out that we had to create a Local administrator with the same password on both computers. And set up the dcom settings for that user on both computers to get it to work.
The computers was in a domain but it was not possible to use a domain user from the Windows 2008 computer.
It worked with domain users from a Windows XP.

Resolution

Create a Local administrator with the same password on both computers. Set up the dcom settings for that user on both computers.
Run Vista with that user.