The socket connection problem is caused by SELinux and the fact that I now additionally open a socket in the new installer app. There seem to be only a few sockets available with enforced SELinux, maybe some party is not allowed to properly close it? I don't know... I'll have to do more research what can be done about this. A reboot should always help.
In normal operation this should not be an issue because the rSAP app opens a socket and never closes it (at least that's the plan).