Re: firewalls

Brian Godette (
Tue, 09 Dec 1997 11:12:33 -0700

At 06:54 PM 12/8/97 -0500, you wrote:
>At 7:22 PM -0500 on 12/6/97, Jason Williams wrote:
>> On Fri, 5 Dec 1997, joeyBabe wrote:
>> > My internet provider ( has installed a firewall. Now I can't
>> > seem to connect to reflector sites. I called their tech support and was
>> > told that I needed to find out the port cu-seeme was using.
>> > Any Help?
>> Judging from the table at
>> The CU-SeeMe client uses TCP ports 7648,7649 and UDP port 7648
>Actually, this page is now out of date. With M-JPEG support there is a new
>UDP port. The following is from White Pine's web site:
> If you are using CU-SeeMe through a firewall, you will need to
> open the following ports:
> To use Chat, and receive grayscale video and audio (other than
> G.723), ports 7648 and 7649 must be open for TCP and UDP.
> To receive M-JPEG video, H.263 video, and G.723 audio, port 24032
> must be open for UDP.
>- Chris

I think M-JPEG being on the same line with H.263 and G.723 may be a typo. I
can understand H.263 and G.723 being on port 24032 since that's the port
used by MPCS for H.323 conferencing, and those two codecs being part of
H.323, but MJPEG is a "standard" WP CU codec that's sent over port 7648.