I got the same error as bashct above.
error code: -32603
error message:
You must set goldminenode=1 in the configuration
Plus the directions say to edit the goldminenode.conf file as you suggested. So I did that but I am left to trying to figure out why I got the error still.
OK. I figured out what I did wrong. There was an extra space between GENKEY and TXID in this command:
mn1 <YOUR_SERVER_IP> :7209 GENKEY TXID 1