Firepass is a Scripts software developed by Alex Dyatlov. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Firepass:

BSEditor: Firepass - is a tunneling tool, allowing to bypass firewall restrictions and encapsulate data flows inside legal ones to use HTTP POST requests. TCP or UDP based protocols may be tunneled with Firepass. For Now, both - client and server parts are written in Perl and the server script acts as a CGI program.

The Firepass key feature is that you may use several type of installation of the server part script in the external network. You do not need to bind any port on the external box. Firepass may also be usable for the reverse task, when the server script is located at the corporative web server and when client interact with it from the external network.