Plex

So when you say can not get in, could you be just a tad more specific?

I would install the latest the beta of the "Router Fimrware" to start as well.

The Plex Version for this router is "1.18.0.1913-e5cc93306  Jul 16, 2019"

That is the latest, so if you have that under settings, Plex Media Server, than you have the "known" latest version of Plex.

Once you have "Enabled Plex Server"

Added A USB Drive or Network Drive to the server

You should be able to login with your free plex account and add the server.

Settings, Plex Media Server, open plex

or if you lan is setup like mine http://192.168.1.1.:32400

or whatever your schema is http://xxx.xxx.xxx.xxx:3240 and proceed to login.

Attached is my setup, hope this might help. If not please let me know, if had all this already, don't flame me or anyone else.

Thats a good way not to get help. I started here with the basics, we can go from here. I have 3 plex servers. 1 on this router, one a corei7 machine and one in a VM. They seem to work fine, and better if you have a free plex login to boot.