Error Add windows system

Hi all,

Recent I've two server run window server 2008, install backup 2010 r3.

I meet issue about Add Windows System error while add on BackupServer. Pls help me fix it.

P/S : I've reinstall BackupAgent on remote server, in publishing tab: it's ok to connect backup server. Services,firewall in Remote server ok.

Thanks a lot to support, 

Tan