2000 client vpn cannot connect to 2000 server

>I have a problem with 2000 client trying to connect to
>2000 server through vpn. The computer was configured
and
>successfully connected to the server. A couple days
>later, I am no longer able to connect but I am able to
>connect from a different location. I believe my vpn
>client on this particular machine is corrupted. I get
an
>error message Error 678: There was no answer. But I
could
>connect from a different machine in a different location.

I tried to connect using a different machine on the same
connection and that doesn't work either. Is there
something going on with my ISP. I have cable and my
speed
is very good. I did a tracert and my hop counts are 15.
Could this be the reason why I'm not getting connected?
What do I need to do?
>
>Any help is very much appreciated.
>
>Thanks
>Andrew
>.