Veeam Troubleshooting: Failed Jobs, VSS Indexing Errors and Snapshot Removal Warnings
The errors behind most Veeam support calls and the exact places to look: in-guest VSS, hypervisor snapshot stun, and repository pressure.
Backup job failures
Indexing needs guest credentials and healthy VSS. Inside the VM run vssadmin list writers - all should be Stable with no errors. Fix failing writers (often SQL or Exchange) by restarting the dependent service. If you do not need file-level search, disable indexing for the job instead of fighting writers, but treat repeated VSS failures as an application health alert.
Veeam creates and removes VMware or Hyper-V snapshots; if removal stalls, the job fails at the end. In vCenter look for lingering snapshots and consolidation warnings, and watch disk latency during removal on the ESXi side. Large busy VMs need longer removal windows - keep datastores under 80% and spread heavy jobs apart.
Restore and repository
Check repository health and space: a SOBR extent in maintenance mode or offline breaks restores that span extents. Run Validate on the backup chain after any storage incident, keep the repository at 80% or less so synthetic operations have room, and on immutable Linux repositories confirm SSH health and that retention locks are not blocking required deletes.
Usually the virtual lab network: wrong VLAN or uplink for the test VM, DNS masquerade misconfiguration, or heartbeat timeouts on slow-booting VMs. Increase the boot timeout, verify the isolated vSwitch or port group, and check the SureBackup log for whether the test VM received an IP at all.