I am having issues with the following scenario:
1) Two node symmetrical Microsoft SQL 2005 Server Cluster
2) Four application servers in the front-end (different subnet)
3) Four application servers in the back-end (same subnet as the DB Cluster)
I have a firewall protecting these two networks and limiting access trough these networks. So I have followed an article which gave me enough information to limit MSTDC to a port-range of 199 ports. I have allowed these ports to go trough the firewall and verified the connection between the MSDTC instance and Front-End & MSDTC instance and Back-end network using DTC PING application. Now the application can normally access from the same subnet (back-end application servers) but the application servers in the front-end cannot process some stuff which rely on MSDTC. I have limited the ports on all servers, restarted them, used DTC ping to verify the connection and it works. The firewall has the necessary firewall rules applied.
I am hoping to get an answer.