An administrator experiences a serious error with an RPA and calls EMC Support to resolve
the issue. They are concerned that the system did not automatically notify EMC Support via
the ESRS gateway. You check all settings in Unisphere Configure System Notification and
find they are correct. What is the most likely cause for this notification failure?

A.
Temporary remote support license key expired

B.
TCP port 990 blocked at their firewall

C.
TCP port 989 blocked at their firewall

D.
TCP port 25 blocked at their firewall