pptp problem

RouterOS General
1

I have a client that needs to create a site to site pptp connection from a w2k3 server with ISA server installed through my wireless network to a server on a public IP on the internet.

I tried different types of pptp connections. From the different MT’s, from a normal pc with client pptp all works fine. I have pptp and gre helpers on, connection tracking on, firewall rules to allow 1732 port and gre - protocol.

When I put the server directly on my network behind the adsl modem bypassing any mikrotik system it works 100%.

What is wrong and how can I fix this?

2

dolf, PPTP tunnel traffic uses TCP port 1723 and IP protocol GRE (Generic Routing Encapsulation, IP protocol ID 47). If this traffic allowed, there should not be any problems with PPTP connection.
pptp and gre helpers required, if there are many PPTP clients under NAT.