You need to capture information behind a firewall with MOM
This is by design
Mom Uses the ports 1270 UDP and TCP for remote agent and management of the server. The UDP is used for heartbeat messages.
When you want to use mom for gathering information about remote server systems you need to open these ports on the firewall.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.