With LMS 3.1, does jrmuser.properties need to be manually updated after running hostnamechange.pl? The former still has the old hostname appended in there. Or does it get updated automatically once I start dmgtd?
Yes, it must be unique. If you have two servers, serverA and serverB, you must use a unique jrm ServiceName on both servers regardless of the LMS version. Both ServiceNames MUST NOT contain dots (thus the hostname component must be the short hostname).