Couldn't start playback when starting music on qnap from webinterface plexamp headless

Plex Players Streaming Devices
1

rpi 3b has been reinstalled from scratch and
odinb/bash-plexamp-installer has been used to install plexamp headless

plexamp pass has been acquired
plexamp does play from e.g. android phone

when trying to play music from headless plexamp www
on screen shortly a message appears : couldn’t start playback
headless plexamp log gives the following

I have **** some info

Jan 05, 2024 23:48:18.507 [Javascript] INFO - HttpServer: [ **** ] GET /player/playback/playMedia providerIdentifier=com.plexapp.plugins.library&protocol=http&containerKey=%2FplayQueues%2F103%3Fown%3D1&address=192.168.1.31&port=32400&token=&key=%2Flibrary%2Fmetadata%2F16806&offset=0&machineIdentifier=01973cd6f4a098b97c21ff161d94dc4952a84820&type=music&commandID=7
Jan 05, 2024 23:48:18.511 [Javascript] INFO - PLAYER: Issuing play for music from server 01973cd6f4a098b97c21ff161d94dc4952a84820
Jan 05, 2024 23:48:18.517 [Javascript] DEBUG - PlayQueue: Processing STOP
Jan 05, 2024 23:48:18.517 [Javascript] INFO - PlayQueue: Stop.
Jan 05, 2024 23:48:18.517 [0x86aff140] INFO - BASS: Stop.
Jan 05, 2024 23:48:18.517 [0x86aff140] INFO - PQCache: Clearing.
Jan 05, 2024 23:48:18.518 [0x86aff140] DEBUG - BASS: Stopped in 0 ms.
Jan 05, 2024 23:48:18.521 [Javascript] INFO - DEVICE: Finding best connection for hifi null.
Jan 05, 2024 23:48:18.522 [0x96fc4040] DEBUG - Networking: Create request 27: (GET **** :32500/resources) network type 2.
Jan 05, 2024 23:48:18.528 [Javascript] DEBUG - PlayQueue: Processing send timelines in state stopped time -1000.
Jan 05, 2024 23:48:18.528 [Javascript] INFO - PlayQueue: Processing play media.
Jan 05, 2024 23:48:18.529 [Javascript] WARNING - DEVICE: No provider for source 01973cd6f4a098b97c21ff161d94dc4952a84820
Jan 05, 2024 23:48:18.529 [Javascript] INFO - DEVICE: Fetching latest provider list from cloud.
Jan 05, 2024 23:48:18.530 [Javascript] INFO - DEVICE: Fetching latest list from cloud.
Jan 05, 2024 23:48:18.530 [Javascript] INFO - DEVICE: Fetching latest cloud player list from sonos.plex.tv
Jan 05, 2024 23:48:18.535 [Javascript] INFO - HttpServer: [192.168.1.43] GET /resources
Jan 05, 2024 23:48:18.537 [Javascript] ERROR - HttpServer: 500 Internal Server Error (/resources): Missing attribute value for attribute machineIdentifier of element Player
Jan 05, 2024 23:48:18.539 [0x84afb140] DEBUG - Networking: Completed request 27: (GET **** :32500/resources) with code 500 (have 25 bytes) in 16 ms.
Jan 05, 2024 23:48:18.540 [Javascript] INFO - DEVICE: Finding best connection for hifi null.
Jan 05, 2024 23:48:18.541 [0x96fc4040] DEBUG - Networking: Create request 28: (GET **** :32500/resources) network type 2.
Jan 05, 2024 23:48:18.543 [Javascript] WARNING - DEVICE: Player connection **** :32500 didn’t work for hifi: HTTP status 500
Jan 05, 2024 23:48:18.543 [Javascript] WARNING - DEVICE: Connection testing failed for hifi
Jan 05, 2024 23:48:18.544 [Javascript] INFO - HttpServer: [192.168.1.43] GET /resources
Jan 05, 2024 23:48:18.546 [Javascript] ERROR - HttpServer: 500 Internal Server Error (/resources): Missing attribute value for attribute machineIdentifier of element Player
Jan 05, 2024 23:48:18.547 [0x84afb140] DEBUG - Networking: Completed request 28: (GET **** :32500/resources) with code 500 (have 25 bytes) in 6 ms.
Jan 05, 2024 23:48:18.549 [Javascript] WARNING - DEVICE: Player connection **** :32500 didn’t work for hifi: HTTP status 500
Jan 05, 2024 23:48:18.552 [Javascript] WARNING - DEVICE: Connection testing failed for hifi
Jan 05, 2024 23:48:18.998 [Javascript] WARNING - DEVICE: Error loading providers or resources, not merging.
Jan 05, 2024 23:48:18.998 [Javascript] WARNING - DEVICE: No provider for source 01973cd6f4a098b97c21ff161d94dc4952a84820
Jan 05, 2024 23:48:18.998 [Javascript] INFO - PlayQueue: Processed play media with success false
Jan 05, 2024 23:48:19.030 [Javascript] WARNING - DEVICE: Error loading providers or resources, not merging.
Jan 05, 2024 23:48:19.030 [Javascript] WARNING - DEVICE: No provider for source 01973cd6f4a098b97c21ff161d94dc4952a84820
Jan 05, 2024 23:48:19.031 [Javascript] INFO - PlayQueue: Processed play media with success false

2

sometimes initial headless playback control from browser fails until you re/select the headless player from the Cast menu

3

After another 3 hours of trying all kinds of combination it finaly worked.
I noticed in the log files the external IP @ of my plex server.

I disabled remote access and in the end I also tried
node /home/plexamp/plexamp/js/index.js with another claim.

From then on I could play music on the headless plexamp.
Another 8h later also the website :32500 was back.

Remote access is enabled again and everything stays up and running.

So my gut feeling is by disabling the remote access and a new claim I forced headless plexamp to use the internal address (which is logical).

4

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