Re: Windows Messenger behind Firewalls and Routers

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From: bjrugg (bjrugg_at_remove.hotmail.com)
Date: 05/24/04 

Date: Mon, 24 May 2004 06:02:10 -0600

The webcam installed fine on a laptop and same webcam worked with yahoo im.
I went back to the desktop with the webcam and the webcam hangs when I do a
webcam compatibility test at
http://help.yahoo.com/help/us/mesg/webcams/index.html
Running this web page in another IE instance gives me an error saying
'ywcupl.dll' is already running and will not go any further.
Will try a few more things later on the desktop - a conflict somewhere

"Bill Holt" <bill@xxitsound.demon.co.uk> wrote in message
news:l0esaTt8ZcsAFw90@itsound.demon.co.uk...
> In message <em8wzxRQEHA.640@TK2MSFTNGP09.phx.gbl>, bjrugg
> <bjrugg@remove.hotmail.com> writes
>>I can get the voice working with Yahoo Messenger, but the video hangs
>>every time. When ever I try to do the Web cam thing on Yahoo IM, the
>>system hangs and I have to restart XP Pro I can get NetMeeting to see the
>>camera webcam, but I have to select it as the ATI is first in the dropdown
>>list of devices. This computer has an ATI video ALL-In-Wonder card (7500)
>>that can do video-in via camcorder and TV and video out also. It looks
>>like the Yahoo Messenger is hanging on the device and pointing to the card
>>as opposed to the camera. I will try the camera on another computer and
>>see what happens.
>
> I've had trouble like this, as to do any meaningful local tests I had to
> run at least 3 machines all with webcams and audio set up.
>
> Although I've used Yahoo Messenger in the past, I know very little about
> it. My 'understanding' is that the Yahoo app uses fixed pre-defined ports
> for the communication and so is less or not at all reliant on UPnP.
>
> Yahoo Messenger and XP Messenger are almost certainly incompatible. Am I
> right to think that the video in YM has to go through Yahoo's servers? The
> video in XP Messenger, when it works, is routed directly peer to peer
> under the direction of the Microsoft servers. This ought to be much more
> efficient, but it does mean that any firewalls have to be aware that the
> Microsoft app might open any one of a huge number of ports.
>
> What I would like to find is a clear explanation somewhere (in simple
> terms for a simpleton like me) of where the decision is made about which
> ports to open for the video in XP Messenger. .
> --
> Bill

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