Which version of opensuse are you using ?
About the jdk, I would have recommended to test with jdk 16.0_u12 or older since the latest changes were made for u13.
I have attached a small testcase to check that jconsole can connect correctly on the rmi registry of your GlassFish, to use it from a command line:
java -jar rmiRegistryTestCase.jar rmi://<hostname>:<port>/jmxrmi <user> <password>
Replace all <...> by the right values.
I hope you get a message different from "objRef null" ...
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