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Avamar Exchange backups fail with the following error: avexvss Error <18187>: Backup Agent is not running under the Avamar backup user account Backups continue to fail even after adding the AvamarBackupUser to all documented required groups. The Exchange backup user verification utility reports conflicting group membership results. Sample Log Output 2019/03/29-08:16:52.16300 [avbackupusercfg.exe] CN=AvamarBackupUser,CN=Users,DC=#######,DC=se 2019/03/29-08:16:52.16300 [avbackupusercfg.exe] Leaving function -createuser::GetSearchStrLDAP 2019/03/29-08:16:52.17899 [avbackupusercfg.exe] User is member of CN=Avamar Roles group 2019/03/29-08:16:52.17899 [avbackupusercfg.exe] User is member of CN=Organization Management group 2019/03/29-08:16:52.17899 [avbackupusercfg.exe] User is member of CN=exchange.trusted subsystem group 2019/03/29-08:16:52.17899 [avbackupusercfg.exe] User is member of CN=exchange.servers group 2019/03/29-08:16:52.17899 [avbackupusercfg.exe] User AvamarBackupUser is NOT a member of Exchange Servers group
Although the required security group memberships are assigned, the group names follow an Exchange Legacy Distinguished Name format instead of the default Exchange security group names. This mismatch causes the Avamar Exchange plug‑in validation to incorrectly treat the AvamarBackupUser account as non‑compliant. Example Detected group: CN=exchange.servers Expected group: Exchange Servers Sample Log Output 2019/03/29-08:16:52.17899 [avbackupusercfg.exe] User is member of CN=exchange.servers group 2019/03/29-08:16:52.17899 [avbackupusercfg.exe] User AvamarBackupUser is NOT a member of Exchange Servers group
Steps for Resolution Verify that the AvamarBackupUser account has all required permissions and group memberships according to the Avamar Plug‑in for Exchange VSS documentation . Confirm that the group names exactly match the default Exchange security group names. If Exchange legacy distinguished names are in use, ensure the Avamar Exchange plug‑in can correctly resolve the group names.
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