I am having a problem in accessing a vpn server running on SuSE Linux V9.2 from Windows XP. The server is behind a netgear adsl modem/gateway/router DG825M. The following ports are opened here TCP 500 (IPSec) TCP 1701 (LT2P) TCP 1743 (PPTP, this includes GRE, according to documentation) The clients sit behind either a DLINK 504 router/modem or a netgear DG825M, neither of the ports is open on the clients side, the tunnel is supposed to go from the clients to the server. I can establish the tunnel from all machines running SuSE Linux V9.2, but not from any Windows XP client (error 721). Most references I found pertaining to this error specify a router issue, but if it is the router, why does the tunnel work under linux? Any hints welcome Thanks Peter Here is my pptpconfig file ipparam jjhawkins lock auth nobsdcomp nodeflate require-mppe mtu 1490 mru 1490 multilink proxyarp lcp-echo-failure 30 lcp-echo-interval 5 +chap +mschap +mschap-v2 ipcp-accept-local ipcp-accept-remote require-mschap-v2 +mppe-128 #require-mppe-stateless and /etc/pptpd.conf speed 115200 option /etc/ppp/options.pptp debug localip 192.168.1.10 remoteip 192.168.1.57-62 pidfile /var/run/pptpd.pid