[USR-TC] MS is not displayed

Hello: TC1000 1-HiPer NMC 2-HiPerARC 10-Hiper DSP Got a strange problem. Several of our dial-in clients are complaining that they can dial-in, are authenticated and can go to various web sites BUT NOT to any 'Microsoft' or 'MSN' web site. For several months, our system is the same with no changes. Two weeks ago, we had was a large number of double bounces on our mail server. This problem started about a week ago. Has anybody seen the same problem? Thanks. Kirti