Problem
After changing the physical location and IP address of the NetBackup servers, attempts to perform backups of a client fail with status code 42: Network read failed.
Media server bpbrm logs are generated but logs are not generated on client, bpcd, vnetd, or bpbkar.
The bpclntcmd -hn and bpclntcmd -ip commands confirm successful name and IP resolution of the client from the perspective of the NetBackup master and media servers.
The bptestbpcd command successfully returns when attempting to connect to the client from the master and media servers, indicating valid network connectivity.
Error Message
The job details' detailed status tab of the backup job reports the status code 42.
The bpbrm logs showed the following after attempting a backup:
13:46:00.877 [7148.6736] <2> local_bpcr_connect: Can't connect to client _no_host_name_for_client_AIX_client_FQDN.com
13:46:00.877 [7148.6736] <2> ConnectToBPCD: bpcd_connect_and_verify(aix01.FQDN.com, _no_host_name_for_client_aix01.FQDN.com) failed: 48
13:46:00.877 [7148.6736] <16> bpbrm Exit: cannot send mail because BPCD on aix01.FQDN.com exited with status 48: client hostname could not be found
Cause
The NetBackup master and media servers were configured with improperly formatted REQUIRED_INTERFACE settings.
If REQUIRED_INTERFACE is to be used, it should be configured with a hostname, which locally resolves to an IP address on the host which REQUIRED_INTERFACE is being configured for. The hostname that the REQUIRED_INTERFACE setting is configured with should resolve to an IP address which is configured for one of the server's network interfaces.
This will change the source IP address of the NetBackup packets to the IP address resolved from the hostname configured in REQUIRED_INTERFACE.
Solution
To resolve the issue, remove the REQUIRED_INTERFACE entries from the NetBackup master and media servers.
Once removed, the backups should be able to complete and return status code 0.
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