Hello !
I arrived there by looking a solution for my own problem, which was exactly the same.
I may have a solution for you.
In France, two Providers (Alice and Club-internet) give Comtrend ADSL modem (CT-633/CT-635 )to their suscribers. And many people using ovh for web site hosting had this problem.
If you tried before to optimize your internet connection by defining a MTU parameter in Windows registry... this really can be the solution
The solution, for us, is to get back to Windows default parameters !! Simpliest way to do this :
- download TCPOptimizer
- Launch it , then go in File, then "Restore Windows Default Parameters"
- Reboot and ... it should work (it worked for me)
Original link for the solution (but in french) :
http://www.extremepc.fr/forum/viewtopic.php?t=1255