If you encounter issues with Sentinel Agent Manager components communicating through a firewall, you may need to verify that you have configured Microsoft Distributed Transaction Coordinator (MSDTC) correctly on all central computers and database servers.
For more information about the MSDTC settings required to install database servers, see Section 2.7, Planning to Install Your Database Server. For more information about the MSDTC settings required to install central computers, see Section 2.8, Planning to Install Your Central Computers.
You can also use the DTCPing tool to verify connectivity between Sentinel Agent Manager computers. DTCPing tests name resolution, RPC communication, and MSDTC communication between two computers that have the tool installed and displays MSDTC settings.
For more information about troubleshooting MSDTC-related issues and using the DTCPing tool, see Microsoft Knowledge Base Articles 250367, 306843, and 918331.