Reference: SteelHead Ports : Interactive ports forwarded by the SteelHead
  
Interactive ports forwarded by the SteelHead
A default in-path rule with the port label Interactive is automatically created in your system. This in-path rule automatically passes through traffic on interactive ports (for example, Telnet, TCP ECHO, remote logging, and shell).
If you don’t want to automatically forward these ports, delete the Interactive rule in the Management Console.
This table lists the interactive ports that are automatically forwarded by the SteelHead.
Port
Description
7
TCP ECHO
23
Telnet
37
UDP/Time
107
Remote Telnet Service
179
Border Gateway Protocol
513
Remote Login
514
Shell
1494
Citrix
1718-1720
h323gatedisc
2000-2003
Cisco SCCP
2427
Media Gateway Control Protocol Gateway
2598
Citrix
2727
Media Gateway Control Protocol Call Agent
3389
MS WBT Server, TS/Remote Desktop
5060
SIP
5631
PC Anywhere
5900-5903
VNC
6000
X11