I’m not able to use Messenger video conference when Comodo Firewal is running (works with ZoneAlarm and others).
I made some network rules following infos bellow but no luck…
BTW : it works well with Skype & Camfrog.
Windows and MSN Messenger Application
A related note: the Messenger Service that runs at the Windows SERVICE level is different from the Windows Messenger or MSN Messenger application. For information about the Messenger APPLICATION see
For file transfer or voice chat ports and NAT information for MSN Messenger 3 see MS Support article Q278887.
Microsoft Knowledge Base Article Q324214 - You cannot make phone calls or start voice or video conversations with Windows Messenger
Windows Messenger 5.0 in Windows XP: Working With Firewalls and Network Address Translation Devices
Microsoft Support WebCast - Microsoft Windows Messenger for Windows XP: New Features, Common Issues, and Troubleshooting July 17, 2002
Windows Messenger - voice (computer to phone)
UDP : 2001-2120, 6801, 6901
from Q324214. NOTE: 6801 is Net2Phone.
MSN Messenger - file transfers
TCP : 6891-6900
from Q278887. Allows up to 10 simultaneous transfers.
MSN Messenger - voice communications (computer to computer)
TCP & UDP : 6901
For Windows Messenger in a non-UPnP environment, unfortunately Microsoft requires dynamic UDP ports across a very wide range. This is a tremendous security risk. Try to establish a UPnP environment if possible. Nevertheless, here is what they say To support [audio and video] in both directions through the firewall, all UDP ports between 5004 and 65535 must be opened to allow signaling (SIP) and media streams (RTP) to traverse the firewall.
Also note: I don’t know how much information for WINDOWS Messenger applies to MSN Messenger and vice versa. I also don’t know how much information for MSN Messenger Windows version applies to MSN Messenger Mac version. And last but not least, there are multiple different versions of Messenger, which may differ in various ways.
More infos (other sources) :
Messenger Live :
UDP : 14072
The MSN Messenger port numbers below are taken from (amongst others) PortForward.com and Experts Exchange discussions Q20968914 and Q20660861.
Unfortunately, trying to block MSN Messenger ports doesn’t work because of the wide range of ports including port 80 that MSN Messenger uses:
TCP port 80 (the ‘http’ standard web port - see also Web Messenger blocking)
TCP port 1863
TCP port 6901 (possibly)
TCP ports 6891 to 6900.
UDP on ports 1503, 3389, 5004-65535
Blocking port 80 removes web browser Internet access.
Also, users will just access MSN Web Messenger and other web messengers
Further information is available from this forum (in German):
"Ports 6891-6900 enable File send,
Port 6901 is for voice communications. Allows Voice, PC to Phone, Messages, and Full File transfer capabilities.
IN TCP 6891 - 6900
IN TCP 1863
IN UDP 1863
IN UDP 5190
IN UDP 6901
IN TCP 6901"
Other information from www.cyberphaze.net (not currently online) gave:
Service: remote: 1963 and 1863 local: 1542 and 1493.
Audio: local: 13803, 1556, 11771
File transfer: remote: 6891 local: 1544
Messenger Update: remote: 80 local: 1457
Sign-In: remote: 443 local: 1484, 2400
Remote Desktop: local/remote: 389, 522, 1503, 1720, and 1731.