SnapCenter version 3 and later vCenter version 5.5 and later Backup of Resource Group using SnapCenter Plug-in for vSphere fails. Error reported while discovering the resource phase. Attempt to backup...SnapCenter version 3 and later vCenter version 5.5 and later Backup of Resource Group using SnapCenter Plug-in for vSphere fails. Error reported while discovering the resource phase. Attempt to backup using the new Resource Group and Policy failed with the same error. SnapCenter error message: Backup of Resource Group 'Group_Name' with policy 'SMVI_DAILY__1' Activity 'Discovering Resources' failed with error: Der Remoteserver hat einen Fehler zurückgegeben: (503) Server nicht verfügbar.