Task Server installs but it is never able to host endpoints (allow to register client machines to itself).
Pending work processing skipped because of paused activities.
Ports 50123 and 50124 were blocked between the site server and notification server.
ITMS 8.1 and later
Test if port is open with telnet between the Task Server and SMP:
telnet <serverip> 50123
telnet <serverip> 50124
Open task ports 50123 and 50124