[gcameron]

I'm getting the following DAS error using C4 multiplexer on Windows 7, the error started with version 2017.07 but figured upgrading to 2018.09 would have solved the issue but still occurring.

The error is Fault (1.2)-2.503.9901
Initialization of diagnosis multiplexer failed.
Possible causes.
The link between the diagnosis multiplexer and the diagnosis socket is interrupted.
The link between the diagnosis multiplexer and the diagnosis unit is interrupted.
The voltage supply at the diagnosis socket (circuit 30 and (or) circuit 31) is faulty.
Note:
When using SDconnect check the connection status using the Toolkit.

Any help would be appreciated, please see attached images, thanks.

OK solved by changing SDConnect from 21 to 04