Hi Markus, yes I'm pretty sure everything was set OK.
For WD i used TCP server ,the standard port 23 and checked enable .and the same IP address as PB since they were on the same machine (2.0.0.100)
IN pB i added serallink and in inspector used IP 2.0.0.100 , port 23 and unchecked Use serial header
This was on a production machine.
I just restarted the whole PC and tried again with a new project but no changes here. Still the exclamation mark
On my laptop I tried the same setup and here no connections either ( not to the other PC and also not to the local WD)
If I send TCP commands directly in WD I have no problems getting through to the other PC ( with PJlink emulator)
All Pc's windows 7
BR
John