I've been through tech support with Linksys, and paid support with Microsoft over this and NOTHING! No one has been able to help me. MY CONFIGURATION: Two LANs at different locations with static IP assignments like this: LAN1 machines : 192.168.1.x , subnet mask 255.255.255.0 LAN2 machines : 192.168.2.x , subnet mask 255.255.255.0 I have Bellsouth ADSL at both locations with Linksys RVS4000s. I have Linux servers and WinXP Pro SP2 workstations on either end, for this discussion let's just focus on the WinXP Pro PCs. With my successfully established an IPSec VPN Tunnel between LANs: * I can ping machines on either end by IP address * I can FTP between machines on either end by IP address * I can SSH between machines on either end by IP address * I can use applications like Laplink & ODBC databases on either end by IP MY PROBLEM: I cannot access ANY shared folders from one LAN to the other over the VPN connection. A shared folder that exists, and is available on LAN1 cannot be accessed on LAN2. I realize NetBIOS browsing and naming doesn't work over VPNs, but even when I try and access the share directly with the IP address as such: \\192.168.1.5\Sharename it says it cannot find the share. I've seen other issues like this posted out there on various forums but not one solution. I've turned off all WinXP firewalls. MY QUESTION(s): Has anyone out there successfully shared files between WinXP machines over their IPSec VPN Tunnel? Can anyone tell me what my problem is? Linksys says it's a Microsoft problem, Microsoft says it's a Linksys problem. What do you say?