You can find out the hostid of the server that's running RLM by running a command line and typing ipconfig /all. You will get a bunch of hostids ("physical adress"), but ignore any virtual ones and look only for the ethernet adapter. Or, to be safer you could also just quickly install Maxwell on that server and license it there. Once it's licensed, run the uninstaller for Maxwell and choose to keep the RLM server and the licenses. Then, on your workstation computer you simply need to create a license file named "maxwell_license.lic" and write in it just a single line:
where computername is the name of the server that's running RLM. This way Maxwell will know to search for a valid license on your server computer. If it doesn't work, try first of all to turn off any firewalls, on both workstation and server, and restart Maxwell to see if it connects. Look in the console panel of Maxwell for more specific license error messages.
Alternatively (if you can't install Maxwell on the RLM server computer): At your workstation, just delete first of all any license files the activator created, start Maxwell and in the options to activate choose the other option - something like "activate license for another computer", and it will ask you to type in the hostid of your server computer. Then once it generates the license file, move it to your server computer, I think it can be in the same folder as the rlm install, or if that doesn't work try recreating the folder structure programdata/next limit/maxwell/licenses.
