I have public DNS on the external address of the isa server, using mutiple ip's the default address is used for internal web clients.ServerA domain.com is primary and will transfer all zones to serverB anotherdomain.com no problems, however I have one secondary zone on serverA transfering from serverB and all I get is error messages. I have checked packet filters on both machines all looks OK. ServerB is a win2k install running routing and remote access. Please help if you can Jim