Our network has two domain controllers running Windows 2003 Ent sp2, DNS without DHCP. There is also a routers to access the external network. There is access to external networks with computers running Windows XP (always work fine). On computers running Windows 7 in the local network have full access to other computers on the same network. But \\<ip-address>\share (ip-address from external network) don't work on computers running Windows 7 SP1 or Windows 2008 R2 SP1. Ping and tracert work fine. And if the computer is not a member of a domain it's work.

1. Ping tests connectivity which is a prerequisite for accessing remote objects. 2. For access to shared folder only port 445 is needed. 3. For visibility you need lagacy ports 137-139. 4. For correctly configured W 7 and W2K8 R2 shared folders are accessible. 5. Access to shared folder over IP is a bit faster when compared with FQDN in UNC notation. You should open firewalls on the W 7 and W2K8 R2 in GPO setting. Regards Milos

On Win 7 Computers in domain. ping <ip-address> successfulltelnet <ip-address> 445 successfulltelnet <ip-address> 139 successfullGPO settings over RSAT from Win 7. Firewall opened. \\<ip-address>\share - error 80070035 net use \\<ip-address>\ipc$ /user:user pwd - system error 53 or system error 64 In wireshark at smb-packet request get an tcp-packet answer: "previous segment lost". In this case, transmission is terminated.

No one knows what could be wrong?