arashaa wrote: » hi ; so the situation is like this : one winxp pc , another pc running win 7 , with an xp and Server 2008 R2 running virtually on the 7...so there are four hosts , 3 client , one server)...my virtual OSs( xp and 7) can connect to server 2008 r2 ( which is a DC) join that domian , but the real xp on another pc won't join the server 2008 domain .they can all ping each other , same configuration on all of the clients , but only virtual clients can join domain...the error relates something to DNS in xp. tnx.