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PPTP Passthrough Mode

Overview

PPTP requires special software when passing through firewalls. This software is included in ClarkConnect Office and Professional 2.x, and all Editions of ClarkConnect 3.1 or higher.

Force PPTP Pass-through on a PPTP Server

There is one restriction for PPTP pass-through mode: a PPTP server must not be running on the same gateway that has PPTP connections crossing it (PPTP pass-through).

If you run a PPTP server on a ClarkConnect gateway, you will not be able to have people from behind the same gateway make reliable outbound PPTP connections to other servers. By default, the firewall will automatically disable PPTP pass-through when the firewall already allows connections to a PPTP server. You will see warning messages in the web-based configuration about these configuration issues.

Depending on the circumstances, you may be able to have both PPTP pass-through and a PPTP server running at the same time. To do this, you need to override the firewall behavior noted in the previous paragraph. In the /etc/firewall file, add the following line:

PPTP_PASSTHROUGH_FORCE="yes"

Then restart the firewall with the following command:

/sbin/service firewall restart