Client had a RHEL 7.2 and SUSE 12 SP2 connected to a secondary hub
that was using a tunnel to connect back to the primary.
From the primary trying to open up IM or AC2 to the robots you would get a communication error.
SUSE 12 SP2
Client Linux admin had enabled:
by setting these values to 1 in the OS configuration for IPV4 TCP files
When the client changed these system setting back to 0 from 1
and restarted the machine the communication to the robots would then work.