Remove & Push Settings failed

I am trying to get profilemanager working - currently sending remove/push settings does fail immediately (remove settings) or is pending forever (push settings: depending on payload?) whereas device enrolment, trust certificate installation, initial installation of settings using the website as well as requesting "Update Info" from profile manager does work.

1. During my research, I found out what ports to open in the firewall - amongst others: 5223

2. The server port should be accessible from 17.0.0.0/8 network

There I already seem to have an issue since I am not quite sure either it is a certificate, firewall, setup or service issue.

Am I wrong if I would expect port 5223 to be listening on the OS X server - at least for localhost?

master:~ root# telnet 127.0.0.1 5223

Trying 127.0.0.1...

telnet: connect to address 127.0.0.1: Connection refused

telnet: Unable to connect to remote host

OS X: 10.10.2

Server: 4.0.3

Client: iPhone 6

iOS: 8.2

Thank you for your suggestions!