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The main limitation about adapters is that each web client can open only one streaming session at a time and a session can be associated to only one Data/Metadata Adapter pair.
So, you probably need...

I can only confirm and expand what was said in this thread
The prescribed way to supply a configuration file from the Remote Server "main" function in "StandaloneLauncher.cs" to the Data Adapter is...

Yes, _server.Start(), as the first action, invokes the Init method in the Adapter.
It seems the most likely place for the exception, as indeed nothing else has been changed.