This may help, as long as the Linux machine has the RSTAT daemon installed and running, the Unix Resource monitor should be able to monitor it.

Start rpc.rstatd of the Linux machine
Unlike regular Unix machines, rpc.rstatd is not started on Red Hat Linux 8.x by default. To start rpc.rstatd under Red Hat Linux, you need to run /etc/rc.d/init.d/rstatd start.

If the possible solution above does not start the rstatd, then please check with your Linux System Administrator for your version of Linux.

Once the rpc.rstatd is running, you should enable rsh connection. Do this by editing the .rhosts file in your $HOME directory and add the Controller name:

For example:

+@[Server Name]
+@sys301lg01