Verify the server(s) listed in the NetBackup Administration Console on the master server under "Host Properties > Master Servers > master server properties > VMware Backup Hosts"
The only servers listed here should be NetBackup servers performing as VMware Backup Hosts. If any Virtual Center Servers or ESX Hosts are listed here they should be removed.
The Virtual Center Server, or the ESX Hosts if there is not a Virtual Center Server in this environment, should be added in the NetBackup Administration Console under "Media and Device Management > Credentials > Virtual Machine Servers"
The reason for the Status 25 is that the validation request is sent to the VMware Backup Host's NetBackup Client Service. This port and service are not present on a Virtual Center Server/ESX Host and will result in a "cannot connect on socket" failure.
2. also check Add the proxy server host name to the NetBackup master server Servers list using the host name resolved by above post.
3.In the NetBackup Administration Console, go to:
NetBackup Management -> Host Properties -> Master Servers -> (double-click the master server to open)
In the master server properties, go to:
Properties -> Servers
In this list add the proxy server using either the fully qualified domain name (FQDN) or short name (as identified by 1 above). If unsure, add both.
Save this change, then stop and restart services on the NetBackup master server to make the changes take effect.