there is a tcp/ip patch available for SP2.
http://www.lvllord.de/?url=downloads&lang=en#4226patch
use it to increse ur half ope conections to 50 or more
windows sets this as 10 for security purposes.
also make change in bitcomet
tools>optopns>advanced>network.max_connections=50(the value u set in tcip/ip patch)