This error could happen when the target database is running in a remote machine..When trying to change the state of the DB it will spawn an remote instance to change the db state…it seems the connection is not happening..
Can you please send the full smo log to investigate this further..
Re: SMO for Oracle RAC ( restore error REMOTE-00005: Timeout of .... spawned helper process )
Can we get the logs from this server to see whether command came to this server..
Just tail this file (on server pbidmcdwh01), tail –f /var/log/smo/server.log and trigger the backup again.. Observe whether any new methods are getting called in that server, if any method is called then there must be smo related logs created in pbidmcdwh01.