Ok when i had this problem it was mainly down to the 1 of the 2 things i'll mention. 1st was MSN didn't like how the Router was setup. So i had to login to the router and downgrade the firmware in order to MSN to work. 2nd was the router started a firewall that didn't allow any messenger software to work. So you'll have to do the same and downgrade the firmware for the Router. The new MSNs are shite. I suggest you use Digsby.