Allow access to two instances by IP and name

Hi

I have a server on a domain which has an IP of 172.27.0.7 and a second IP of 172.27.0.8.

I have two instances installed. SERVER/INST1 and SERVER/INST2.

I have set up INST1 to listen on 172.27.0.7 1433 and INST2 to listen on 172.27.0.8 1433.

This works fine. When I try to connect from another server to SERVER/INST1 it works fine but when I try to connect to SERVER/INST2 it fails.

I have had to turn "LISTEN ALL" to NO for both instances due to them both using 1433 in IPALL.

If I change the second instance to listen to 1434 on IPALL and then change LISTEN ALL to YES the named instance works but then it will not speak to 172.27.0.8 1433 only 172.27.0.8 1434 even though I specified the TCP port in the correct location.

Please cab you let me know what else I can try?

Thanks

Sam