IIS will not respond in multihomed enviroment

[MAB]

We have a Win 2000 server setup as a web server and are
moving from a fractional T-1 line to broadband. We had
hoped to leave the T-1 in place until the broadband was up
and all the DNS changes propagated but we are not able to
get IIS to respond to the new broadband connection.
We can get out to the internet fine and SonicWall assures
us the firewall is not blocking traffic. Any attempt to
access the website through this new connection results in
a DNS error - can not find the server. We can ping into
the SonicWall and tracert shows we are getting to the
site. Internal address are under NAT.
We have narrowed it down to routing or IIS not directing
the response correctly. But IIS should not be directing
the response at all Correct? The routing looks correct.

Any ideas?
Thank you,
Michael

 

[Carl DaVault [MSFT]]

Every server box has a "lite" version of netmon.

Check out what is happening with netmon... is the web server receiving the
right packets?

Ping the web server, tracert to the web server, then http to the web server
and look for traffic on TCP port 80.

Did the IP address of the web server change? It's possible to set up IIS to
only listen on certain IP's. You can use netstat on the IIS server to view
the listening ports.

Still lots of troubleshooting steps left for you. Don't forget to check
eventlogs on the web server and routers/firewalls/etc.