PMS checks in with servers at plex.tv to verify remote access. If that check-in fails for some reason PMS will incorrectly show remote access is not available.
See thread below for more info.
FYI, It is happening on multiple platforms. I run PMS on a Synology DS918+. Mine was showing unavailable earlier today even though canyouseeme.org said it was available. Clicking on “Retry” forced PMS to check-in w/ plex.tv and things went green.
In Plex Dashboard, does the connection show a Remote or Indirect when somebody is streaming remotely?
If Remote, check the bandwidth & quality settings on the remote client.
If Indirect, clients might be connecting via Plex Relay for some reason.
