Really? What address did it give? Last time I tried to ping Yahoo!
it was blocked. Perhaps your HOSTS file is redirecting you?
In any case ping doesn't prove that there is a server available
at that address. What do you see if you telnet to port 80 there?
It should be sufficient just to type: GET /
However, I think that your real problem may be your TIF.
Did you clear it before you tried to start using your new service?
Does the problem occur only on sites you have previously visited?
If the TIF was not cleared IE may be sending it information that it learned
from your old service and possibly confusing the new one.
Good luck
Robert Aldwinckle