The backups on the MS Cluster work fine after a reboot of the servers until a failover happens on the cluster. Once a failover happens, I get an error 41. The master is using NBU 6.0 MP5 (HP-UX) and the client is NBU5.1 MP6 (WIN2003). I am backing up both physical machines (C & Shadow Copy Components) and the Virtual Node (Specific Drive Letters) in different policies. Both policies fail with an error 41. I can reboot the servers and the backups work fine until a failover occurs. Any clues?