reply to FlameN
Firewall is off with no filters. I'm 99% sure. Gonna check tomorrow morning.
If that doesn't work - have you tried connecting your vpn client directly to the vpn server for a sanity check?
Just tested it. VPN functions normaly when connecting from External client to Windows Server and Windows server to Internal VPN server. all firewalls are off.
reply to bdnhsv A bit of an update. The packets not getting to the Internal VPN server are displayed in wireshark as protocol: "ppp lcp" with info: configuration request