Failed to start client agent on the host

Challenge

Backup job fails with lines in the logs like this:

 <…>

[timestamp] <01> Error    Timeout to start agent   à Veeam.Backup.AgentProvider.CClientAgentProtocol.WaitReadyState()

[timestamp] <01> Info     Task operation result: 'Failed to start client agent on the host '***.***.*.***'\nTimeout to start agent'

[timestamp] <01> Info     Job has been stopped successfully. Name: [Réplication ***].

Cause

Solution