here at office we're using pfSense as firewall (let call it FirewallOffice). We have some servers running at data center, there pfSense is doing firewalling (let call it FirewallServers).
I connect servers at data center by using built-in VPN of pfSense (FirewallServers). If I'm at office, I cannot connect there if I'm at office. But if I'm in another company (they use WLAN-Router) or at home, VPN-Connection works fine.
If I'm at office and try other VPN-Connection for example to other Company with Windows Small Business Server as VPN-Server. It works fine too.
Why can't I connect from office to FirewallServer? Maybe you could point me where to look?