Upgraded vCenter 8.03.0000 fails with VAMI backup to existing SMB share

[acpzehetal]

We have upgrade our VDI vCenter in the last week to 8.03.0000 and the upgrade process has been functioning without any error. In the following we tried to backup our "NEW" vCenter and always get the typical error message "General system error reported by backup server.".

In the former version 7.03h vCenter the file-based backup always runs without any issues to our DataDomain SMB share and the same user. In the /var/log/vmware/applmgmt/applmgmt.log we get every time the same three error lines:

25-06-18T14:56:58 PM CEST [54306]ERROR:plugins.SMBClientStorageIOLib:Command failed with error: NT_STATUS_BAD_NETWORK_PATH
2025-06-18T14:56:58 PM CEST [54306]ERROR:plugins.SMBClientStorageIOLib:smb cmd failed. RC: 1, Err: , Cmd: ['/usr/bin/smbclient', '//sbgdd02/Vcenterbackup/', '-A', '/dev/shm/smbCredentialFil  ebdoseikl', '-t', '140', '-c', ' ls']
2025-06-18T14:56:58 PM CEST [54306]ERROR:vmware.appliance.vapi.impl:pint.Error('com.vmware.applmgmt.backup.plugin.internal_server_err', 'General system error reported by backup server.', **  {'args': ['Plugin error occurred. ErrCode: 5, Args: ()']})

We have changed the target settings to either FQDN or IP, but the error is always the same. 

Does anyone know what we msiconfigured or which SMB setting is wrong according to the Version 8 of vCenter?

[a_p_]

Only a guess. 

Make sure that the vCenter Server DNS settings look as expected (DNS server addresses, DNS Domain).
Then delete the current vCSA Backup Schedule (don't just edit it), and create it again using the DD's FQDN in the share name.

Btw. are you using a domain user account, or a local DD user account for backup?

André

[jvansickler]

Check to see if the backup account password has expired or is locked out (in AD or on the server hosting the share, whichever you're using).

Jim