Surrogate Socket is a MUST HAVE if you own Microsoft Proxy Server.

With Surrogate Socket you can:

Telnet to your private routers, or any other telnet host.
Access your internal Windows Terminal Server or Citrix Winframe or Metaframe from the Internet.
Access FTP servers on your private network from the Internet.
Access any TCP application which uses static ports.
And much more. (NEW!!! Now supports SQL*Net)

All This...

WITHOUT setting up a DMZ.
WITHOUT splitting your Internet subnet.
WITHOUT complicated custom packet filters.
WITHOUT exposing unwanted services to the Internet.