Service is running but can't connect to localhost

[axis75]

Had this working perfectly a few days ago, headless on a NUC on Debian 13. Booted up today and the app refused to connect. Hooked up a monitor and keyboard and can't even connect locally via the web browser.

sudo systemctl status pipedald tells me everything is running and happy apparently. What else can I check?

[rerdavies]

Post the system logs for pipedal. Run:

sudo journalctl -b 0 | grep pipedald

[axis75]

Many thanks:

Aug 02 10:59:19 pipedal systemd[1]: Starting pipedald.service - PiPedal Web Service...
Aug 02 10:59:20 pipedal pipedald[973]: Document root: /etc/pipedal/config Threads: 5
Aug 02 10:59:20 pipedal pipedald[973]: Locale: en_NZ
Aug 02 10:59:20 pipedal pipedald[973]: Checking for updates.
Aug 02 10:59:20 pipedal pipedald[973]: Updater: Failed to fetch update info. Server has no internet access.
Aug 02 10:59:24 pipedal pipedald[973]: Updater: Next update check at 2026-08-02 14:59:20
Aug 02 10:59:24 pipedal pipedald[973]: Scanning for LV2 Plugins
Aug 02 10:59:24 pipedal systemd[1]: Started pipedald.service - PiPedal Web Service.
Aug 02 10:59:24 pipedal pipedald[973]: Waiting for ALSA device hw:XUSB.
Aug 02 10:59:34 pipedal pipedald[973]: ALSA device hw:XUSB not found.
Aug 02 10:59:38 pipedal pipedald[973]: Failed to start audio. hw:XUSB playback device not found. (No such device)
Aug 02 10:59:38 pipedal pipedald[973]: Audio started. ALSA, null, 32-bit float little-endian, 48000, 256x6, device: 2/2, main: 1/2, aux: 0/0
Aug 02 10:59:38 pipedal systemd[1]: pipedald.service: Main process exited, code=killed, status=11/SEGV
Aug 02 10:59:38 pipedal systemd[1]: pipedald.service: Failed with result 'signal'.
Aug 02 10:59:38 pipedal systemd[1]: pipedald.service: Consumed 272ms CPU time, 100.7M memory peak.
Aug 02 10:59:43 pipedal systemd[1]: pipedald.service: Scheduled restart job, restart counter is at 1.
Aug 02 10:59:43 pipedal systemd[1]: Starting pipedald.service - PiPedal Web Service...
Aug 02 10:59:43 pipedal pipedald[1337]: Document root: /etc/pipedal/config Threads: 5
Aug 02 10:59:43 pipedal pipedald[1337]: Locale: en_NZ
Aug 02 10:59:43 pipedal pipedald[1337]: Updater: Next update check at 2026-08-02 14:59:20
Aug 02 10:59:47 pipedal pipedald[1337]: Scanning for LV2 Plugins
Aug 02 10:59:47 pipedal systemd[1]: Started pipedald.service - PiPedal Web Service.
Aug 02 10:59:47 pipedal pipedald[1337]: Waiting for ALSA device hw:XUSB.
Aug 02 10:59:57 pipedal pipedald[1337]: ALSA device hw:XUSB not found.
Aug 02 10:59:57 pipedal pipedald[1337]: CrashGuard: Detected previous crash, count = 1
Aug 02 11:00:01 pipedal pipedald[1337]: Failed to start audio. hw:XUSB playback device not found. (No such device)
Aug 02 11:00:01 pipedal pipedald[1337]: Audio started. ALSA, null, 32-bit float little-endian, 48000, 256x6, device: 2/2, main: 1/2, aux: 0/0
Aug 02 11:00:01 pipedal systemd[1]: pipedald.service: Main process exited, code=killed, status=11/SEGV
Aug 02 11:00:01 pipedal systemd[1]: pipedald.service: Failed with result 'signal'.
Aug 02 11:00:06 pipedal systemd[1]: pipedald.service: Scheduled restart job, restart counter is at 2.
Aug 02 11:00:06 pipedal systemd[1]: Starting pipedald.service - PiPedal Web Service...
Aug 02 11:00:06 pipedal pipedald[1882]: Document root: /etc/pipedal/config Threads: 5
Aug 02 11:00:06 pipedal pipedald[1882]: Locale: en_NZ
Aug 02 11:00:06 pipedal pipedald[1882]: Updater: Next update check at 2026-08-02 14:59:20
Aug 02 11:00:10 pipedal pipedald[1882]: Scanning for LV2 Plugins
Aug 02 11:00:10 pipedal systemd[1]: Started pipedald.service - PiPedal Web Service.
Aug 02 11:00:10 pipedal pipedald[1882]: Waiting for ALSA device hw:XUSB.
Aug 02 11:00:20 pipedal pipedald[1882]: ALSA device hw:XUSB not found.
Aug 02 11:00:20 pipedal pipedald[1882]: CrashGuard: Detected previous crash, count = 2
Aug 02 11:00:24 pipedal pipedald[1882]: Failed to start audio. hw:XUSB playback device not found. (No such device)
Aug 02 11:00:24 pipedal pipedald[1882]: Audio started. ALSA, null, 32-bit float little-endian, 48000, 256x6, device: 2/2, main: 1/2, aux: 0/0
Aug 02 11:00:24 pipedal kernel: ppdl_alsaDriver[1904]: segfault at 0 ip 0000561845080d94 sp 00007f1d4affcb18 error 6 in pipedald[275d94,561844e57000+4b0000] likely on CPU 3 (core 1, socket 0)
Aug 02 11:00:24 pipedal systemd[1]: pipedald.service: Main process exited, code=killed, status=11/SEGV
Aug 02 11:00:24 pipedal systemd[1]: pipedald.service: Failed with result 'signal'.
Aug 02 11:00:29 pipedal systemd[1]: pipedald.service: Scheduled restart job, restart counter is at 3.
Aug 02 11:00:29 pipedal systemd[1]: Starting pipedald.service - PiPedal Web Service...
Aug 02 11:00:29 pipedal pipedald[1909]: Document root: /etc/pipedal/config Threads: 5
Aug 02 11:00:29 pipedal pipedald[1909]: Locale: en_NZ
Aug 02 11:00:29 pipedal pipedald[1909]: Updater: Next update check at 2026-08-02 14:59:20
Aug 02 11:00:33 pipedal pipedald[1909]: Scanning for LV2 Plugins
Aug 02 11:00:34 pipedal systemd[1]: Started pipedald.service - PiPedal Web Service.
Aug 02 11:00:34 pipedal pipedald[1909]: Waiting for ALSA device hw:XUSB.
Aug 02 11:00:44 pipedal pipedald[1909]: ALSA device hw:XUSB not found.
Aug 02 11:00:44 pipedal pipedald[1909]: CrashGuard: Detected previous crash, count = 3
Aug 02 11:00:48 pipedal pipedald[1909]: Failed to start audio. hw:XUSB playback device not found. (No such device)
Aug 02 11:00:48 pipedal pipedald[1909]: Audio started. ALSA, null, 32-bit float little-endian, 48000, 256x6, device: 2/2, main: 1/2, aux: 0/0
Aug 02 11:00:48 pipedal kernel: ppdl_alsaDriver[1920]: segfault at 0 ip 000055dc4e845d94 sp 00007fcfa9b82b18 error 6 in pipedald[275d94,55dc4e61c000+4b0000] likely on CPU 2 (core 0, socket 0)
Aug 02 11:00:48 pipedal systemd[1]: pipedald.service: Main process exited, code=killed, status=11/SEGV
Aug 02 11:00:48 pipedal systemd[1]: pipedald.service: Failed with result 'signal'.
Aug 02 11:00:53 pipedal systemd[1]: pipedald.service: Scheduled restart job, restart counter is at 4.
Aug 02 11:00:53 pipedal systemd[1]: Starting pipedald.service - PiPedal Web Service...
Aug 02 11:00:53 pipedal pipedald[1922]: Document root: /etc/pipedal/config Threads: 5
Aug 02 11:00:53 pipedal pipedald[1922]: Locale: en_NZ
Aug 02 11:00:53 pipedal pipedald[1922]: Updater: Next update check at 2026-08-02 14:59:20
Aug 02 11:00:57 pipedal pipedald[1922]: Scanning for LV2 Plugins
Aug 02 11:00:57 pipedal systemd[1]: Started pipedald.service - PiPedal Web Service.
Aug 02 11:00:57 pipedal pipedald[1922]: Waiting for ALSA device hw:XUSB.
Aug 02 11:01:07 pipedal pipedald[1922]: ALSA device hw:XUSB not found.
Aug 02 11:01:07 pipedal pipedald[1922]: CrashGuard: Detected previous crash, count = 4```

[axis75]

Looks like it's looking for my x32 (which is what I used last time) - I have a different audio interface connected now; could that be the issue?

[rerdavies]

It looks like that's the root cause of the problem, although, obviously, it should not do that. I'll take a look at the code to see if I can figure out what's going on.

In the meantime, I think you can work around the problem as follows. Run the following command, and then reboot.

sudo rm /var/pipedal/AudioConfig.json

You will have to reconfigure your audio adapter after you are done.

If that doesn't work, send me another log file.

[axis75]

Thanks - removed that AudioConfig.json file (confirmed it's gone!) but still no go. Have tried with an without an audio interface plugged in. Latest logfile output as follows:

Aug 02 17:09:11 pipedal systemd[1]: pipedald.service: Scheduled restart job, restart counter is at 15.
Aug 02 17:09:11 pipedal systemd[1]: Starting pipedald.service - PiPedal Web Service...
Aug 02 17:09:11 pipedal pipedald[2882]: Document root: /etc/pipedal/config Threads: 5
Aug 02 17:09:11 pipedal pipedald[2882]: Locale: en_NZ
Aug 02 17:09:11 pipedal pipedald[2882]: Updater: Next update check at 2026-08-02 20:55:42
Aug 02 17:09:11 pipedal pipedald[2882]: Scanning for LV2 Plugins
Aug 02 17:09:11 pipedal pipedald[2882]: No ALSA device selected.
Aug 02 17:09:11 pipedal systemd[1]: Started pipedald.service - PiPedal Web Service.
Aug 02 17:09:11 pipedal pipedald[2882]: CrashGuard: Detected previous crash, count = 52
Aug 02 17:09:11 pipedal pipedald[2882]: Failed to start audio. Audio configuration not valid.
Aug 02 17:09:11 pipedal pipedald[2882]: Audio started. ALSA, null, 32-bit float little-endian, 48000, 256x6, device: 2/2, main: 1/2, aux: 0/0
Aug 02 17:09:11 pipedal systemd[1]: pipedald.service: Main process exited, code=killed, status=11/SEGV
Aug 02 17:09:11 pipedal systemd[1]: pipedald.service: Failed with result 'signal'.
Aug 02 17:09:16 pipedal systemd[1]: pipedald.service: Scheduled restart job, restart counter is at 16.
Aug 02 17:09:16 pipedal systemd[1]: Starting pipedald.service - PiPedal Web Service...
Aug 02 17:09:16 pipedal pipedald[2895]: Document root: /etc/pipedal/config Threads: 5
Aug 02 17:09:16 pipedal pipedald[2895]: Locale: en_NZ
Aug 02 17:09:16 pipedal pipedald[2895]: Updater: Next update check at 2026-08-02 20:55:42
Aug 02 17:09:16 pipedal pipedald[2895]: Scanning for LV2 Plugins
Aug 02 17:09:16 pipedal pipedald[2895]: No ALSA device selected.
Aug 02 17:09:16 pipedal systemd[1]: Started pipedald.service - PiPedal Web Service.
Aug 02 17:09:16 pipedal pipedald[2895]: CrashGuard: Detected previous crash, count = 53
Aug 02 17:09:16 pipedal pipedald[2895]: Failed to start audio. Audio configuration not valid.
Aug 02 17:09:16 pipedal pipedald[2895]: Audio started. ALSA, null, 32-bit float little-endian, 48000, 256x6, device: 2/2, main: 1/2, aux: 0/0
Aug 02 17:09:16 pipedal pipedald[2895]: Listening on mDns address pipedal.local:80
Aug 02 17:09:16 pipedal pipedald[2895]: Listening on Wi-Fi address 192.168.1.61:80
Aug 02 17:09:17 pipedal kernel: ppdl_alsaDriver[2906]: segfault at 558821ed4 ip 0000558801828d94 sp 00007f83f1d82b18 error 6 in pipedald[275d94,5588015ff000+4b0000] likely on CPU 2 (core 0, socket 0)
Aug 02 17:09:17 pipedal systemd[1]: pipedald.service: Main process exited, code=killed, status=11/SEGV
Aug 02 17:09:17 pipedal systemd[1]: pipedald.service: Failed with result 'signal'.
Aug 02 17:09:17 pipedal systemd[1]: pipedald.service: Consumed 199ms CPU time, 72.6M memory peak.
Aug 02 17:09:22 pipedal systemd[1]: pipedald.service: Scheduled restart job, restart counter is at 17.
Aug 02 17:09:22 pipedal systemd[1]: Starting pipedald.service - PiPedal Web Service...
Aug 02 17:09:22 pipedal pipedald[2916]: Document root: /etc/pipedal/config Threads: 5
Aug 02 17:09:22 pipedal pipedald[2916]: Locale: en_NZ
Aug 02 17:09:22 pipedal pipedald[2916]: Updater: Next update check at 2026-08-02 20:55:42
Aug 02 17:09:22 pipedal pipedald[2916]: Scanning for LV2 Plugins
Aug 02 17:09:22 pipedal pipedald[2916]: No ALSA device selected.
Aug 02 17:09:22 pipedal systemd[1]: Started pipedald.service - PiPedal Web Service.

[LeHachoir]

Hi Axis75, reconnect your X32 and route your I/O to channels 1 and 2.
I had the same problem as you: I had left the routing set to channels 31 and 32.

[demym]

I have often this problem... whenever i forget to attach the originally installed audio card, the web service stops working.... even if uninstall pipedal and reinstall it, the problem still persists...
I also tried to remove /var/pipedal/AudioConfig.json and restarted the PI, but same result... web interface not available..

I think we need a reset command of something similar...whenever this happens, the only solution for me had been to reflash the OS from scratch , and then reinstall pipedal ontop... would be great if simply the service starts the same, leaving the UI to reconfigure for the current audio card used.

In the past i had success with the HXStomp

i paste some log view, thanks in advance:

ain: 2/2, aux: 0/0
Aug 28 09:25:48 RPI4 systemd[1]: pipedald.service: Main process exited, code=killed, status=11/SEGV
Aug 28 09:25:48 RPI4 systemd[1]: pipedald.service: Failed with result 'signal'.
Aug 28 09:25:53 RPI4 systemd[1]: pipedald.service: Scheduled restart job, restart counter is at 46.
Aug 28 09:25:53 RPI4 systemd[1]: Starting pipedald.service - PiPedal Web Service...
Aug 28 09:25:53 RPI4 pipedald[4630]: Document root: /etc/pipedal/config Threads: 5
Aug 28 09:25:53 RPI4 pipedald[4630]: Locale: en_GB
Aug 28 09:25:53 RPI4 pipedald[4630]: Updater: Next update check at 2026-08-28 17:01:41
Aug 28 09:25:53 RPI4 pipedald[4630]: Scanning for LV2 Plugins
Aug 28 09:25:53 RPI4 pipedald[4630]: No ALSA device selected.
Aug 28 09:25:53 RPI4 systemd[1]: Started pipedald.service - PiPedal Web Service.
Aug 28 09:25:53 RPI4 pipedald[4630]: CrashGuard: Detected previous crash, count = 48
Aug 28 09:25:53 RPI4 pipedald[4630]: Failed to start audio. Audio configuration not valid.
Aug 28 09:25:53 RPI4 pipedald[4630]: Audio started. ALSA, null, 32-bit float little-endian, 48000, 256x6, device: 2/2, main: 2/2, aux: 0/0
Aug 28 09:25:53 RPI4 systemd[1]: pipedald.service: Main process exited, code=killed, status=11/SEGV
Aug 28 09:25:53 RPI4 systemd[1]: pipedald.service: Failed with result 'signal'.
Aug 28 09:25:59 RPI4 systemd[1]: pipedald.service: Scheduled restart job, restart counter is at 47.
Aug 28 09:25:59 RPI4 systemd[1]: Starting pipedald.service - PiPedal Web Service...
Aug 28 09:25:59 RPI4 pipedald[4643]: Document root: /etc/pipedal/config Threads: 5
Aug 28 09:25:59 RPI4 pipedald[4643]: Locale: en_GB
Aug 28 09:25:59 RPI4 pipedald[4643]: Updater: Next update check at 2026-08-28 17:01:41
Aug 28 09:25:59 RPI4 pipedald[4643]: Scanning for LV2 Plugins
Aug 28 09:25:59 RPI4 pipedald[4643]: No ALSA device selected.
Aug 28 09:25:59 RPI4 systemd[1]: Started pipedald.service - PiPedal Web Service.
Aug 28 09:25:59 RPI4 pipedald[4643]: CrashGuard: Detected previous crash, count = 49
Aug 28 09:25:59 RPI4 pipedald[4643]: Failed to start audio. Audio configuration not valid.
Aug 28 09:25:59 RPI4 pipedald[4643]: Audio started. ALSA, null, 32-bit float little-endian, 48000, 256x6, device: 2/2, main: 2/2, aux: 0/0
Aug 28 09:25:59 RPI4 systemd[1]: pipedald.service: Main process exited, code=killed, status=11/SEGV
Aug 28 09:25:59 RPI4 systemd[1]: pipedald.service: Failed with result 'signal'.