This is a post I found by Birdy about Clearwire...
http://www.gnutellaforums.com/showpo...9&postcount=13
The best port numbers are between 49152 up to 65535, try this one 64049....
Also Vista - McAfee - limewire don't mix to well at the moment, so I would also suggest you try this advice in this post as well....
http://www.gnutellaforums.com/showpo...38&postcount=1