Not that I know much, but is that Windows? If so, 1.8.3 won't work - it's not whitelisted. The 1.8.3 whitelisted is for Mac..
1 link:http://bakabt.me/whitelist.php
Try another client on the whitelist temporarily.Try also resetting your entire network (modem, router, switches, connected devices, etc.) - shut everything down and start it back up.