You are doing nothing wrong: the add-on uses the --allowed flag, to set allowed IP addresses from the add-on settings.
I gather this sets rpc-whilelist-enabled to true.
By default, allowed IP addresses are *.*.*.* (any address).I thought the log would show whether a client tried to connect and why it fails to connect, but it does not.
Two questions:
1. Are you trying to connect from within your network, or from outside your network?
2. If you are connecting from outside your network, have you forwarded the web-ui port (9091)?
Thanks again, Thoradia.
I'm trying to connect from within my network and, yes, I also have forwarded the port 9091.