The issue with the RTM and DFM on the same server is the following bug: CSCdt62297: 'RTM and another trap receiver application cannot coexist.'
There is a workaround though:
If you install RTM and another trap receiver application (such as Device Fault Manager) on the same server, you must configure each
application to receive traps properly. By default, RTM listens on port 162.
To change the setting so that RTM is not the primary listener application:
In RTM:
Step 1: Stop the nGenius Server.
Step 2: Open the file /RTMROOT/rtm/bin/ngeniusnative.properties.
Step 3: Change this line:
devicelistener.portlist=162,395
to:
devicelistener.portlist=395
Step 4: Save and close the ngeniusnative.properties file.
Step 5: Restart the nGenius Server.