I have a Sonicwall SOHO3 firewall, which on one side is connected to the Internet and on the other side to my LAN directly. On the LAn I have a Windows 2000 Server Domain COntroller running MS Exchange 2000, ISA 2000 and VPN Server.
I have configured the NAT on the firewall to access the Windows 2000 Server machine. The ports that are open to reach this server are 80,25, 1723, 500.
IP Address within my office is 172.31.8.xx . The Rules on the firewall are to allow the above metioned ports for the local IP of the server (172.31.8.xx)
I am able to connect a VPN connection successfully from within the LAN to this VPN Server. However, I am unable to do the same from the Internet.
Are there any other ports that need to be open for this to work successfully.
I tried the following on the Windows 2000 Server itself :
1. telnet localhost 25 --> Worked
2. telnet localhost 1723 --> Worked
3. telnet localhost 500 --> Did Not work.