Some time ago, we switched from MPLS to site-to-site VPN between two sites. When MPLS was in place, there was absolutely no problems with the backup. After the switch, the backup jobs started to fail. The backup software is Backup Exec 2010 R2.
The job failure seems to have no pattern. If I would run the same job twice, once it would fail and I would rerun it without a problem next time.
Both sites have 100Mbps connections and use the same service provider so the connection is reasonably fast. I get on average 5ms RTT for pings. VPN tunnel is setup on ASA's. Interfaces on the switches are clean without any errors.
Below are the error messages I get when the job fails:
1. The job failed with the following error: An unknown error has occurred.
2. An error occurred while processing a B2D command.
Drive: Write() WriteFile failed 0/64 @4189892 (\\192.168.2.2\B2D033004.bkf). Error=64
3. Storage device reported an error on a request to write data to media. Error reported:
The specified network name is no longer available