According to these sites, port 554/7070 are the key ones for rtsp/pnm. 
Perchance, do we have blocked?  V

http://service.real.com/help/library/guides/g270/htmfiles/links.htm
http://service.real.com/help/library/guides/helixuniversalserver/htmfiles/setup.htm


> One of our classrooms is being used to host a MIT_Alum livecast tomorrow 
> evening [thur].
> 
>   We were given a url to test the connection/firewall which seems to go 
> nowhere:
> 
> http://web.mit.edu/webcast/50k/2007/mit-100k-finals-16may2007-220k.ram
> 
>   The broadcast link is Broadband (RealMedia 8 or later) & apparently 
> the .rpm suffix means a RealAudioMetafile.
> 
> This is a little confusing.  Apparently, the .ram  suffix means files 
> that launch a RealAudio player as an application *external* to the Web 
> browser & a .rpm suffix refs files that launch RealAudio player as a 
> plug-in application *within* the Web browser?
> 
> Also, from what I can tell the prefix should be RTSP://  for Real Time 
> Streaming Protocol instead of HTTP://
> 
> Does anyone have any insights or experience with this?
> 
> 
> -V
> 
> refs:
>
http://service.real.com/help/library/guides/realone/ProductionGuide/HTML/htmfiles/extensn.htm
> http://www.uth.tmc.edu/scriptorium/howto/ra-training/using-ra.html
>