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This error message "Proceed Ack failed" will occur if the client doesn't receive the initial handshake ack from the backup server within the stipulated time. By default, it will wait for 1800 secs [30 mins]. The other possible reason for this issue might be,

1) Failed to access the storage repository location in the backup server.

2) Failed to access the backend database.

3) The return ack might be dropped due to a transient network problem, which might be resolved automatically in the next schedule. Please check whether the issue gets resolved in the next consecutive schedule.

However, to identify the exact root cause of the issue in your environment, we need to check the log files. So, send the zip of the log folder(VembuBDRInstallation>\log) to vembu support at vembu-support@vembu.com.