Cannot enable remote access after moving Plex install to new computer

Plex Media Server Remote Access
1

Server Version#:1.43.0.10492
Player Version#:4.156.0

Today, I moved my Plex server install to a new computer (Windows 10 → Windows 10) using the official Plex guide: https://support.plex.tv/articles/201370363-move-an-install-to-another-system/ This seems to have broken remote access for me.

I am consistently getting the “Not available outside your network: Your server is signed in to Plex, but is not reachable from outside your network.” error under Settings → Remote Access.

I have manually specified an external port and used https://canyouseeme.org/ to verify that it can be seen. I even tried disabling the Windows firewalls, which did not help.

Simply put, nothing about my network situation has changed between the time I unplugged the old PC and plugged in the new one. I have gone through the guide at https://support.plex.tv/articles/200931138-troubleshooting-remote-access/ multiple times and nothing there seems to help or be applicable.

2

Did you use the same external port number that you used with the old server?

Is the old server still running?