SMB backups failing with com.vmware.applmgmt.backup.plugin.timeout error

Products

• VMware vCenter Server

Issue/Introduction

SMB backups failing  with com.vmware.applmgmt.backup.plugin.timeout error

backup.log
YYYY-MM-DDTHH:MM:SS UTC [17083]INFO:plugins.SMBClientStorageIOLib:Running Command: ['/usr/bin/smbclient', '//FQDN/vCSA_Backup/', '-A', '/dev/shm/smbCredentialFilek7k1he9w', '--send-buffer', '100M', '-c', 'cd NAME/; ls']
YYYY-MM-DDTHH:MM:SS UTC [17083]ERROR:plugins.SMBClientStorageIOLib:Timeout while running command
YYYY-MM-DDTHH:MM:SS UTC [17083]ERROR:vmware.appliance.vapi.impl:pint.Error('com.vmware.applmgmt.backup.plugin.timeout', 'Operation timed out.', **{'args': ['Plugin error occurred. ErrCode: 7, Args: ()']})
YYYY-MM-DDTHH:MM:SS UTC [17083]INFO:cis.vpxdevent_lib:Event com.vmware.applmgmt.backup.job.failed.event successfully posted to http://localhost:8085/sdk

Environment

VMware vCenter Server 7.0.0

Cause

The issue stems from the domain name resolving to multiple IP addresses. The initial IP address returned by the DNS server might not be the one that is accessible for mounting the share. This leads to the "NT_STATUS_BAD_NETWORK_NAME" error because the SMB client cannot connect to the share using the provided IP address.

Resolution

To resolve the backup issue, try connecting to the backup server using its IP address instead of its fully qualified domain name (FQDN).