streaming audio to internet using wme 9 or expression encoder 4 on server 2012

I hope someone can help. I am successfully using wme 9 to stream live audio from a phone line to the line in on the server. This is accessible on internet from a link on my website to the ip and port address on the server. This works fine, but I am unable to configure it on a new server either 2008 or 2012 using the server essentials and media pack. the current server is marginally working and needs retirement. I am completely stumped as to why I can't get it to work on any other machine. I am using the same router and forwarding to the same ports on each server that I am testing. The media player reports that there is a network connection problem on each of the servers, except for the only working 2008 server.