If you encounter issues while attempting a restore involving the vPower NFS feature, please see Troubleshooting vPower NFS Datastore Mounting Issues.
Veeam Backup & Replication uses IP address authorization to restrict access to the Veeam vPower NFS Share. When a restore involving Veeam vPower NFS is initiated, the IPs of all ESXi hosts in the environment are added to an allowlistHKLM\SOFTWARE\WOW6432Node\Veeam\Veeam NFS\Connections for access to the vPower NFS Share. After the restore is completed, the allowlist entries are removed. However, until the vPower NFS Service is restarted, the allowlist change will not be enforced. If the vPower NFS Service is restarted or the Mount Server itself is restarted, the change in the allowlist is enforced, causing the datastore to become marked as inaccessible.