Hmm, the most time consuming problems always has the simplest fixes!
I've somehow copied the server-config.wsdd into <server_root>/server/default/deploy. Bad move.
Anyway, after deleting the misplaced file everything seems OK, for now ...
Are you able to see the jboss-net/services web application? Is there any other step you did to make this work?
I posted my problem at another link:
It doesn't appear to be working for me.