I also experienced this problem at first. This is because I haven't set domain search in my network card configuration (under hostname/DNS tab). After I set it to my domain name, this problem has gone .

Since my computer is behind a proxy, I've got another problem . The problem is I haven't been authenticated yet. But I do have included the authentication (username & password) string in the proxy address.

Any ideas, guys?

Thanks before and sorry for my english