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Encoder 15.1(Build42). When encoding is running, other applications out of the Adobe creative license, that are not running at that time, cannot be launched. Always with the message :
Your subscription status cannot be confirmed.

All applications already running will continue to run without any problems.
But e.g. starting Photoshop from within Premiere (or starting it directly) to correct graphics is not possible.
After quitting the media encoder the problem is no longer existent.
That means you can't continue to work.
This means that the media encode does not make any sense.

There are no connection problems with the Internet - as indicated by the offered solution. To be on the safe side, I went through the guide.