The only streaming server that I am aware of on OS/2 is Icecast. It handles OGG and MP3 stuff, you can find more information at:http://www.icecast.org/
There is an OS/2 port that was referenced recently on the message base for Dink's Z! mp3 player. Here's the original message:
http://dink.org/z/zmsgbase.html?read=M6X2D2W1R0&printall=yes
The link to the file is:
http://froloff.homeip.net/utils/icecast-os2.zip