all problems solved; xmpp server was restarting due to permission on .pem file. modified this and works fine now. verification problem in the app was due to a typo; a space in ‘’ ‘clubhouse.motorbende.net|217.122.173.95’ after .net caused the problem.
Everything now works like a charm. (and I learned a lot about docker and xmpp 
The instruction to set up the docker version of Kontalk is very good.
Regards René
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