Could be to much information and the servers cant cope or the site is takeing action as if it is a virus and is blocking.
Goodluck

uhh erase the cookies if there are.. then spoof yo ip add.. don;t know if it works.. but I always spoof my ip if I got blocked from blah blah blah.. then I can access it again..

Windows XP SP2 imposed a TCP connection limit. Check your windows event log: Start -- Run -- eventvwr.msc -- to see if this is your problem.

You can increase or remove the limit:
http://www.speedguide.net/read_articles.php?id=1497

If this is not your problem then something is likely throttling your TCP SYN packets (new connections). After you send the stats with your program then open up a command line and "telnet www.site.com 80" and see if the telnet session opens up. If the session opens type "GET /" without the quotes and press enter a few times. Note what the server does and how long it takes to respond and post it back here.

in my code i didnt close the connection right, so after it quit the server kept sending rst packets