Telnet over TMG

Question

i have enabled telnet on a public IP published by TMG on port 25 
i removed the fire wall rule that was made for that and i am still able to telnet ?!
i waited for some time 
configured telnet on another IP , and i am not able to telnet on the new IP wail still able on the old REMOVED one ?!
i restarted TMG control service which restart all other services , and i am still getting the same result 
is this a bug or what ? 

Answer 1

If you are targeting TCP-Port 25, then that is SMTP,...not officially "Telnet" which is TCP-23.  There is already a default predefined Protocol for "SMTP" and so there is no need to create a custom protocol that overlaps the SMTP
protocol.
So your rule would be:
Name: "SMTP Mail Rule" (just as an example)
From: Internal
To: External
Protocol: SMTP
Users: All Users
Since your internal Mail Server (assuming you have one) will already be using such a rule to do it's job,...or if your Mail Server is external or "hosted", then the Mail Clients are going to use the same Rule to reach the Mail Server to do their
job (assuming SMTP/POP3 clients),....you are then using that Rule to "Telnet" over.  Hence there is no need for a special "Telnet Rule", nor would such a rule even be actively used unless it was placed above the SMTP Rule
in the Rule List,...and if that was the case your Mail would be using that Rule as well instead of using the actual SMTP Rule it should have been using.
In other words you can't have two Rules that effectively do the same thing,...if you do so, only the one higher in the Rule list will be used and the lower one will be ignored,...regardless of whatever you may have intended.