Cannot access server locally through app.plex.tv (works remotely)

EDIT: It was a DNS rebinding issue after switching from 1.1.1.1 to my ISP DNS. You can delete this post.

Server Version#: latest docker (1.24.2.4973)

Today out of the blue my Plex server stopped responding on the local network.

If I try to access my server from app.plex.tv while on the same network as the server, it seems unreachable.

If I try to access it via local-ip:32400 I get ERR_EMPTY_RESPONSE since I set SSL to required (if I enforce https and disregard warnings it works).

I can access the server without issues remotely via app.plex.tv, but not locally.
I can also access the server via the iOS and Windows apps both locally and remotely.

While loading app.plex.tv on the LAN I get the following errors in the browser console:

  • net::ERR_NAME_NOT_RESOLVED (while trying to resolve the plex domain that points to the local ip)

Is this an issue related to SSL certificates? How can I go about renewing SSL certs for the server?

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