Hi guys

We didn't do anything, but suddenly the backup failed.
Below is the log where the backup failed.
May I know what caused the failure?

2022-01-30 21:03:36 awcbimage Warning <66690>: CTL workorder "xxxxxxxxxxxxxx" non-zero exit status 'code 158:cannot establish connection with server (possible network or DNS failure)'
2022-01-30 21:03:37 awcbimage Error <0000>: [IMG0010] pax_container::appenddata on attributes.xml returned problme:32
2022-01-30 21:03:37 awcbimage Error <0000>: [IMG0010] pax_container::endfile('attributes.xml',1132) returned problem:32
2022-01-30 21:03:37 awcbimage Error <0000>: [IMG0010] pax_container::beginfile('virtdisk-descriptor.vmdk',462) returned problem:32
2022-01-30 21:03:37 awcbimage Error <0000>: [IMG0010] pax_container::beginfile('virtdisk-flat_vmdk) returned problem:32
2022-01-30 21:03:37 awcbimage Error <0000>: [IMG1003] backup of [datastore4] hostname_xx.xx.xx.xx/hostname_xx.xx.xx.xx.vmdk failed
2022-01-30 21:03:37 awcbimage Error <0000>: [IMG0011] Avtar exited with 'code 158: cannot establish connection with server (possible network or DNS failure)'
2022-01-30T21:03:36. 106-09:00 avnwcommWarning <0000>: Plug-in returned non-zero exit code (158). Aborting NetWorker connection.
2022-01-30 21:03:36 avtar Error <10623>: Failed make dir /cur/eece3dc694959daedd73c50138c49b8555620cec for backup, LSU: avamar-1544092814, ddrHandle: 1, DDR result code:5004, desc: nothing matched
2022-01-30 21:03:36 avtar Error <10544>: Data Domin login to dd6800.datadomin FAILED
2022-01-30 21:03:36 avtar Error <10509>: Problem logging into the DDR server.", only GSAN communication was enabled.
2022-01-30 21:03:36 avtar FATAL <17964>: Backup is incomplete because file "/ddr_files.xml" is missing
2022-01-30 21:03:36 avtar FATAL <8941>: Fatal server connection problem, aborting initialization. Verify correct server address adn login credentials.
2022-01-30 21:03:36 avtar Info <6149>: Error summary: 5 errors: 10623, 10544, 8941, 10509, 17964