Plex on Western Digital: Enable Secure Connections (only)

Hi my Name is Mathias, and I have a Question:

I have enable the secure connection, but jet i dont get a connection via Web to return the configuration.
What can i do?

greetings
Mathias

to add:

I have do this, to get a connection with the Plex Win App, but it still does not work.
The app reports, that the server is offline.

I also have no access with the https link, he does not find a server.

However, the iOS app connects quite normally, as before the change.

That means that your home network (or more precisely your router and/or your ISP) are to blame.