Upgraded from 2.1.2 to 2.1.3 Immediately got this error:
Exception occurred at 10/5/2016 9:34:41 AM: Source: Data Grid Server (VM-xx-xxxx)
Reason: Failed to send partitioned task to Management Server vm-xx-xxxx. Reason: rpcclient::createsession() failed. Access Denied. Message: Communication failure.
Access is denied.
Details: dgsrpcinterface::createsession failed!
Object Type: wsusserver
I've started a ticket with Support, but haven't heard anything, and was hoping someone else had seen this, and could point me in the right direction.
ended up reinstalling the 2.1.3 update, and it fixed the issues I was having.