Depending on the situation, it may be necessary to troubleshoot an unresponsive server, troubleshoot a performance issue, or extend the timeout.
When the error refers to an SSH connection to a repository, the most common resolution is to reboot either the repository server, or the storage device (such as a NAS mounted via NFS) connected to that repository server. A repeated need to reboot to work around this error may indicate insufficient resources allocated to the repository server.
To extend the timeout, create the following registry value on the Veeam Backup & Replication server:
Key: HKLM\SOFTWARE\Veeam\Veeam Backup and Replication\
Value (DEC): 600000
Make sure no jobs or restores are running, then restart the Veeam Backup Service to apply this change.