Windows Server 2008 Can't connect to Samba external share

view story

http://serverfault.com – I have a server running Windows Server 2008 R2 on a remote DC and another server running CentOS 6.2 (in another remote DC) which has a Samba configured too. From my local machine I can access the samba share with the right permissions without problems. But when I try to connect to my samba share from the Windows Server 2008 machine it doesn't works. I don't understand, I ran tcpdump on the samba machine, and the Windows server doesn't even sent the first packet to the samba machine. So, I think it must be some configuration with the Windows server. (HowTos)