I know you already mentioned a troubleshooting guide and forum post, but since there are at least 2 relevant articles, please read through both Remote Access and Troubleshooting Remote Access support pages.
Then step through this guide: The Basics of Remote Access Troubleshooting
If you have been unable to get remote access working after you have completed all of the above (please be thorough and don’t skip any steps, or think you’ve already done all of this so you don’t need to bother), come back and we’ll get some details from you and proceed from there.
The remote access going green initially is a red herring. It will always go green after you make a change, while Plex is actually checking the access. Once the check is complete it correctly changes to red. It is not actually briefly working and then stopping.
Some common things that seem to trip people up are:
- Windows is set to Public network profile instead of Private
- As VPN usage becomes more prevalent, people forget they have it enabled, or don’t realize that it will cause remote access issues
