When the Syncrify client starts a backup job, the server assigns a Job ID to client. This job ID is sent to the server for every HTTP request the client makes. This job ID is volatile, meaning it is stored in server's memory space not on disk.
This job ID becomes invalid if:
The server is restarted
The client takes too long to respond and server thinks it is dead. By default, the server waits for 5 hours before considering a client dead.
The most common reason for getting this error is if Syncrify server is restarted while a backup is running. When the server comes back up, it does not accept requests from the client because the Job ID is no longer valid.
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