Plexamp can not connect via reverse-proxy without explicit ports

Plex Labs
1

I’m using Plexamp 4.10.1 on iOS. It works well on my local network, but it runs into trouble when I’m accessing via a reverse proxy on the public Internet. I found some relevant lines in the plexamp log files:

Jun 22, 2024 11:04:54.091 [Javascript] INFO - DEVICE: Initializing manager.
Jun 22, 2024 11:04:54.091 [Javascript] INFO - DEVICE: Fetching latest provider list from cloud.
Jun 22, 2024 11:04:54.091 [Javascript] INFO - DEVICE: Fetching latest list from cloud.
Jun 22, 2024 11:04:54.091 [Javascript] INFO - DEVICE: Fetching latest cloud player list from https://sonos.plex.tv
Jun 22, 2024 11:04:54.091 [Javascript] INFO - DEVICE: Starting connection test.
Jun 22, 2024 11:04:54.091 [Javascript] INFO - LRUCache: Loading 0 entries into Loudness cache.
Jun 22, 2024 11:04:54.091 [Javascript] INFO - LRUCache: Loading 0 entries into AlbumCodec cache.
Jun 22, 2024 11:04:54.091 [0x6af6f000] DEBUG - Networking: Create request 2: (GET https://plex.tv/media/providers) network type -1.
Jun 22, 2024 11:04:54.091 [0x6af6f000] DEBUG - Networking: Create request 3: (GET https://sonos.plex.tv/resources) network type -1.
Jun 22, 2024 11:04:54.091 [Javascript] INFO - DEVICE: Looking for an active server in 2 total servers.
Jun 22, 2024 11:04:54.091 [Javascript] INFO - DEVICE: Finding best connection for transpi XXX.
Jun 22, 2024 11:04:54.091 [0x6af6f000] DEBUG - Networking: Create request 4: (GET https://XXX.plex.direct:32400/) network type -1.
Jun 22, 2024 11:04:54.096 [0x6af6f000] DEBUG - Networking: Create request 5: (GET https://my-custom-domain.com:22078/) network type -1.
Jun 22, 2024 11:04:54.096 [0x6af6f000] DEBUG - Networking: Create request 6: (GET http://my-custom-domain.com:22078/) network type -1.
Jun 22, 2024 11:04:54.096 [0x6af6f000] DEBUG - Networking: Create request 7: (GET https://plex.tv/api/v2/user/privacy.json) network type -1.
Jun 22, 2024 11:04:54.097 [0x6af6f000] DEBUG - Networking: Create request 8: (GET https://plex.tv/api/v2/resources?includeHttps=1&includeRelay=1) network type -1.
Jun 22, 2024 11:04:54.097 [Javascript] INFO - ACCOUNT: Refreshing data.
Jun 22, 2024 11:04:54.098 [0x6baeb000] DEBUG - Networking: Create request 9: (GET https://plex.tv/api/v2/user.json?includeSubscriptions=1&includeProviders=1) network type -1.
Jun 22, 2024 11:04:54.105 [0x6b7a3000] DEBUG - Networking: Completed request 5: (GET https://my-custom-domain.com:22078/) with code -7 (have 0 bytes) in 8 ms.
Jun 22, 2024 11:04:54.105 [Javascript] WARNING - DEVICE: Server connection https://my-custom-domain.com:22078 didn't work for transpi: HTTP status -7
Jun 22, 2024 11:04:54.105 [0x6b7a3000] DEBUG - Networking: Completed request 6: (GET http://my-custom-domain.com:22078/) with code -7 (have 0 bytes) in 8 ms.
Jun 22, 2024 11:04:54.105 [Javascript] WARNING - DEVICE: Server connection http://my-custom-domain.com:22078 didn't work for transpi: HTTP status -7
Jun 22, 2024 11:04:54.123 [0x6b7a3000] DEBUG - Networking: Completed request 4: (GET https://XXX.plex.direct:32400/) with code 200 (have 8334 bytes) in 26 ms.
Jun 22, 2024 11:04:54.123 [Javascript] INFO - DEVICE: Server connection worked for transpi ~ https://XXX.plex.direct:32400
Jun 22, 2024 11:04:54.123 [Javascript] INFO - DEVICE: Reading libraries and features from transpi
Jun 22, 2024 11:04:54.123 [0x6af6f000] DEBUG - Networking: Create request 10: (GET https://XXX.plex.direct:32400/media/providers?includePreferences=1) network type -1.
Jun 22, 2024 11:04:54.195 [0x6b7a3000] DEBUG - Networking: Completed request 10: (GET https://XXX.plex.direct:32400/media/providers?includePreferences=1) with code 200 (have 30275 bytes) in 71 ms.
Jun 22, 2024 11:04:54.197 [Javascript] INFO - DEVICE: Found 5 libraries from transpi: Home, Movies, TV Shows, Music, Playlists
Jun 22, 2024 11:04:54.197 [Javascript] INFO - DEVICE: Got working server of transpi

I have replaced my server id with XXX, and my custom domain with my-custom-domain.com in the above logs.

Both https://my-custom-domain.com and http://my-custom-domain.com were configured as “Custom server access URLs” in the Plex server configuration, and I’m able to access the Plex instance via https://my-custom-domain.com using a web browser.

I was confused as to where the 22078 port is coming from in the logs. My reverse-proxy is not listerning on this port at all, hence the CURLE_COULDNT_CONNECT errors in the logs for these requests.

I thought of updating the “Custom server access URLs” to include explicit port numbers (https://my-custom-domain.com:443), and Plexamp immediately started working! I’m confused as to why this is required though, I didn’t see 22078 in the settings anywhere, is this expected behavior? If so, where is it documented?

2

I think if you’re not explicit about it, the server probably publishes the custom URL with the port it’s managed to open in the router or something like that. But the intent is for the custom URL to specify the port when needed.

3

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