Upload problems..

Hi,

Please let me know if there is a solution for this issue.

http://www.websecurity.mobi/free-bro...-wireless.html

Couple of months back i had no problems with the wireless speed, but now from couple of days i started having the problem.
Iam unable to upload any files via email thru yahoo/gmail and when i try the speed test from this website.
http://www.auditmypc.com/internet-speed-test.asp
Download shows close to 4816 kbps but for Upload it gives a error saying client cannot send/recieve packets to the port 8600.

Upload and internet works perfectly fine when connected via wired netwrk.
Is there a problem with the wireless adapter, or router but others are able to transfer data without any problem with the same wireless connection.

PLease update.

Thanks,