BackupExec Remote Agent. Member Server moved into new Domain

Hi

We have a Backup Exec 2010 R3 SP2 Server in DOMAINA that used to backup a Member Server containing SQL that was also in DOMAINA. 

The backup exec remote Agent is installed on this member Server. 

The member Server has been moved in to a new domain but Backups have been failing. The remote agent services are started. 

IF I look at the backup exec job for this remote server and try to test the resource credentials I get an "a communictations failure has occured" 

The firewall is off on the remote Server. 

Can anyone help ?

Thanks