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Block Yahoo Messenger

TerminatorX v2 can block Yahoo Messenger, block MSN Messenger, block Windows Live Messenger, block AIM Messenger, block Web Messengers, block LimeWire, block emule, block Facebook , Block YouTube, block chat, block gambling sites - over 450 choices available .
 

Use it in addition to your firewall for extra security. TerminatorX runs invisibly and when one of the chosen programs is detected, TerminatorX shuts it down.

You can find out who is trying to use programs or web sites that you have banned. TerminatorX Monitor shows 'Terminated' programs on for example a Technician's workstation. A 'real time' display shows the attempts being made. This screenshot shows a typical view:

Download Monitor now - free add-on to TerminatorX

If future programs or web sites become a problem, you can easily block them in a matter of minutes.

Visit our main page to read more details, or read some opinions of customers

How to block Yahoo Messenger by blocking ports

According to Yahoo's web site:

 "Yahoo! Messenger will automatically search the firewall for an open port, and, if it finds one, use that to connect".

The order in which Yahoo Messenger scans for available ports is:

1. port 5050
2. port 80
3. All available ports

This means that blocking Yahoo Messenger by blocking ports will not work. Yahoo Messenger will only switch ports and use a different one.

Even if you were able to block Yahoo Messenger by this method, your employees or students would just change to Yahoo Web Messenger - which is accessed as a web page in Internet Explorer or other browsers using port 80.

Other information from www.cyberphaze.net (not currently online) gave:

Yahoo! Messenger
Service: remote: port 5050, 5150, and 8000 local: 5101 and 1638
Audio: remote: 5001 local: 1644 and 5000
File transfer: remote: 1614 local: 80/81/82
Webcam: remote: 80 local: 1677

Y!Tunnel
Service: remote: 1455, 5050, 1071, and 1074 local: 8000, 8001, and 1073
 

This site indicates that the ports used are:

Voice Chat: TCP 5000 & 5001, UDP 2000-5010
Messages: TCP 5050 which reinforces the information above
Webcam video: TCP 5100 - which differs from the cyberphaze ports
Games: TCP 11999