Upgraded from NBU 5.1 MP3 to 6.0. My Servers that are in an active\active cluster backups failed with "license use exceeded" error. We had a similar problem when we upgraded from 4.5 to 5.1. The fix for this was 5.1 MP2. The Server's virtual node is being seen as another machine. This isn't a remote client, it's the same machine just a virtual node on that machine. I'm surprised that since Veritas fixed this with 5.1 MP2 that they didnt include the same binary when they designed 6.0. I have logged a case with Veritas Support.