Support intro
Sorry to hear you’re facing problems. 
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Getting help
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- Official documentation (searchable and regularly updated)
- How to topics and FAQs
- Forum search
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can. 
The Basics
- Nextcloud Server version (e.g., 29.x.x):
32.0.5
- Operating system and version (e.g., Ubuntu 24.04):
Raspberry Pi OS 12 Bookworm on the Raspberry Pi and Debian 12 Bookworm on HPB server
- Web server and version (e.g, Apache 2.4.25):
Apache 2.4.66 on Raspberry Pi and Nginx on HPB server
- Reverse proxy and version _(e.g. nginx 1.27.2)
Nginx Proxy Manager (NPM) version 3.8
- PHP version (e.g, 8.3):
8.2.29
- Is this the first time you’ve seen this error? (Yes / No):
Yes
- When did this problem seem to first start?
Always
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
Basic"Linux Apache MySQL PHP"(LAMP) on Raspberry Pi, Docker Nginx Proxy Manager (NPM) and Docker High Performance Backend (HPB)
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
No
- Box and Router
French Freebox in "bridge mode" and Stormshiled router
Summary of the issue you are facing:
On one side I’ve installed Nextcloud on a Raspberry Pi 5 with the basic LAMP webarchive technique on Raspberry Pi OS 12 Bookworm.
On the other side I’ve got a traditional computer with Debian 12 Bookworm. There I installed Docker, Docker compose, Ngnix Proxy Manager and High Performance Backend with this technique : High Performance Backend for Talk on Nextcloud with Docker
On the Stormshield router the ports 80, 443, 3478 and 8181 are correctly open.
In the NPM configuration the Nextcloud redirection work very well.
I registered the subdomains with my registrar.
The server turn seems to be responding well.
Talk works on smartphones but I can’t write anything on the web server.
Steps to replicate it (hint: details matter!):
Depending on the settings in the docker-compose.yml file of the HPB serveur, I get either a 400 error or a 502 error. But it never works.
I don’t understand why. I’ve tried everything.
In the logs below, there are IP addresses 172.x.y.z that I don’t recognize. And I don’t know what ports 4222 and 8188 correspond to.
Thank you very much for your help.
Log entries
Nextcloud
Please provide the log entries from your Nextcloud log that are generated during the time of problem (via the Copy raw option from Administration settings->Logging screen or from your nextcloud.log located in your data directory). Feel free to use a pastebin/gist service if necessary.
[no app in context] Erreur: Client error: POST http://signal.assolsf05.fr/api/v1/room/za5i3dps resulted in a 400 Bad Request response:
<html>
<head><title>400 Bad Request</title></head>
<body>
<center><h1>400 Bad Request</h1></center>
<hr><center>open (truncated...)
POST /ocs/v2.php/apps/spreed/api/v4/room/za5i3dps/participants/active
de my.public.ip.address par my-name à 7 févr. 2026, 23:37:44
[spreed] Erreur: Failed to send message to signaling server, 2 retries left!
POST /ocs/v2.php/apps/spreed/api/v1/chat/za5i3dps
de 78.246.195.139 par my-name à 6 févr. 2026, 10:15:14
[spreed] Avertissement: Client error: `POST https://signal.my-domain.fr/api/v1/room/room-number` resulted in a `400 Bad Request` response:
400 Bad Request
POST /ocs/v2.php/apps/spreed/api/v1/chat/room-number
de my-ip par my-name à 9 févr. 2026, 16:57:38
Web Browser
If the problem is related to the Web interface, open your browser inspector Console and Network tabs while refreshing (reloading) and reproducing the problem. Provide any relevant output/errors here that appear.
PASTE
Web server / Reverse Proxy
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
Docker log
docker logs nextcloud-talk-hpb
++ hostname -i
++ grep -oP ‘[0-9]+.[0-9]+.[0-9]+.[0-9]+’
++ head -1
IPv4_ADDRESS_TALK_RELAY=172.19.0.2
++ dig signal.my-domain.fr IN A +short +search
++ grep ‘
0-9.+$’
++ sort
++ head -n1
IPv4_ADDRESS_TALK=my.public.address
++ dig signal.my-domain.fr AAAA +short +search
++ grep ‘
0-9a-f:+$’
++ sort++ head -n1
IPv6_ADDRESS_TALK=
set +x
IP_BINDING=::
grep -q 1 /sys/module/ipv6/parameters/disable
grep -q 1 /proc/sys/net/ipv6/conf/all/disable_ipv6
grep -q 1 /proc/sys/net/ipv6/conf/default/disable_ipv6
set +x
[33] 2026/02/09 14:48:47.315365 [INF] Starting nats-server
[33] 2026/02/09 14:48:47.315432 [INF] Version: 2.12.3
[33] 2026/02/09 14:48:47.315442 [INF] Git: [450a519]
[33] 2026/02/09 14:48:47.315449 [INF] Name: NBXIC4ERNLOOYPDXAIN7JUUPJ7JOSL6ITTIBGK3QKTLMPBWLQEQMOHTH
[33] 2026/02/09 14:48:47.315460 [INF] ID: NBXIC4ERNLOOYPDXAIN7JUUPJ7JOSL6ITTIBGK3QKTLMPBWLQEQMOHTH
[33] 2026/02/09 14:48:47.315478 [INF] Using configuration file: /etc/nats.conf (sha256:SHA fingerprint)
[33] 2026/02/09 14:48:47.317995 [INF] Listening for client connections on 127.0.0.1:4222
[33] 2026/02/09 14:48:47.318069 [INF] Server is ready
Janus version: 1303 (1.3.3)
Janus commit: 07c61050038c7d745013fae8bc8e99d7365c31f1
Compiled on: Thu Jan 15 12:50:32 UTC 2026
Logger plugins folder: /usr/local/lib/janus/loggers
Starting Meetecho Janus (WebRTC Server) v1.3.3
Checking command line arguments…
Debug/log level is 3
Debug/log timestamps are disabled
Debug/log colors are disabled
[WARN] Janus is deployed on a private address (172.19.0.2) but you didn’t specify any STUN server! Expect trouble if this is supposed to work over the internet and not just in a LAN…
main.go:161: Starting up version 2.0.4~docker/go1.25.0 as pid 34
main.go:168: Using a maximum of 4 CPUs
natsclient.go:108: Connection established to nats://127.0.0.1:4222 (NBXIC4ERNLOOYPDXAIN7JUUPJ7JOSL6ITTIBGK3QKTLMPBWLQEQMOHTH)
grpc_common.go:176: WARNING: No GRPC server certificate and/or key configured, running unencrypted
grpc_common.go:178: WARNING: No GRPC CA configured, expecting unencrypted connections
backend_storage_static.go:82: Backend backend-1 added for https://subdomain.my-domain.fr/
hub.go:243: Using a maximum of 8 concurrent backend connections per host
hub.go:250: Using a timeout of 10s for backend connections
hub.go:283: No trusted proxies configured, only allowing for [127.0.0.0/8, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16]
hub.go:324: Not using GeoIP database
hub.go:402: No candidates allowlist
hub.go:413: No candidates blocklist
mcu_common.go:110: Maximum bandwidth 1048576 bits/sec per publishing stream
mcu_common.go:117: Maximum bandwidth 2097152 bits/sec per screensharing stream
mcu_janus.go:164: Using a timeout of 10s for MCU requests
mcu_janus.go:176: No candidates allowlist
mcu_janus.go:188: No candidates blocklist
main.go:265: Could not initialize janus MCU (dial tcp 127.0.0.1:8188: connect: connection refused) will retry in 1s
[WARN] libcurl not available, Streaming plugin will not have RTSP support
[WARN] libogg not available, Streaming plugin will not have file-based Opus streaming
[ERR] [plugins/janus_streaming.c:janus_streaming_init:2784] Can’t add ‘ondemand’ mountpoint ‘file-ondemand-sample’, unsupported format (we only support raw mu-Law and a-Law files right now)
[WARN] No Unix Sockets server started, giving up…
[WARN] The ‘janus.transport.pfunix’ plugin could not be initialized
Exec: /opt/eturnal/erts-15.2.6/bin/erlexec -noinput +Bd -boot /opt/eturnal/releases/1.12.2/start -mode embedded -boot_var SYSTEM_LIB_DIR /opt/eturnal/lib -config /opt/eturnal/releases/1.12.2/sys.config -args_file /opt/eturnal/releases/1.12.2/vm.args -erl_epmd_port 3470 -start_epmd false – foreground
Root: /opt/eturnal
/opt/eturnal
mcu_common.go:110: Maximum bandwidth 1048576 bits/sec per publishing stream
mcu_common.go:117: Maximum bandwidth 2097152 bits/sec per screensharing stream
mcu_janus.go:164: Using a timeout of 10s for MCU requests
mcu_janus.go:176: No candidates allowlist
mcu_janus.go:188: No candidates blocklist
mcu_janus.go:369: Connected to Janus WebRTC Server 1.3.3 by Meetecho s.r.l.
mcu_janus.go:377: Found JANUS VideoRoom plugin 0.0.10 by Meetecho s.r.l.
mcu_janus.go:382: Data channels are supported
mcu_janus.go:386: Full-Trickle is enabled
mcu_janus.go:393: Created Janus session 2134904943125295
mcu_janus.go:400: Created Janus handle 6299396306783555
main.go:297: Using janus MCU
hub.go:454: Using a timeout of 10s for MCU requests
backend_server.go:112: No IPs configured for the stats endpoint, only allowing access from 127.0.0.1
main.go:378: Listening on 0.0.0.0:8081
Configuration
Nextcloud
The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):
"system": {
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"subdomain.my-domain.fr",
"local.address.ip.nextcloud",
"signal.my-domain.fr"
],
"trusted_proxies": "***REMOVED SENSITIVE VALUE***",
"forwarded_for_headers": [
"X-Forwarded-For",
"HTTP_X_FORWARDED_FOR"
],
"overwriteprotocol": "https",
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "32.0.5.0",
"overwrite.cli.url": "https:\/\/subdomain.my-domain.fr",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"mysql.utf8mb4": true,
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"maintenance_window_start": 1,
"mail_smtpmode": "smtp",
"mail_sendmailmode": "smtp",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "465",
"mail_smtpsecure": "ssl",
"mail_smtpauth": 1,
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"default_phone_region": "FR",
"filelocking.enabled": true,
"memcache.distributed": "\\OC\\Memcache\\Redis",
"memcache.local": "\\OC\\Memcache\\Redis",
"memcache.locking": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": 6379,
"password": "***REMOVED SENSITIVE VALUE***",
"timeout": 0
},
"maintenance": false,
"theme": "",
"loglevel": 2,
"versions_retention_obligation": "disabled",
"forbidden_filename_characters": [
"<",
">",
":",
"\"",
"|",
"?",
"*",
"\\",
"\/"
],
"forbidden_filename_extensions": [
" ",
".",
".filepart",
".part"
],
"files.chunked_upload.max_size": 536870912,
"forbidden_filename_basenames": [
"con",
"prn",
"aux",
"nul",
"com0",
"com1",
"com2",
"com3",
"com4",
"com5",
"com6",
"com7",
"com8",
"com9",
"com\u00b9",
"com\u00b2",
"com\u00b3",
"lpt0",
"lpt1",
"lpt2",
"lpt3",
"lpt4",
"lpt5",
"lpt6",
"lpt7",
"lpt8",
"lpt9",
"lpt\u00b9",
"lpt\u00b2",
"lpt\u00b3"
]
}
}
Apps
The output of occ app:list (if possible).
Tips for increasing the likelihood of a response
- Use the
preformatted textformatting option in the editor for all log entries and configuration output. - If screenshots are useful, feel free to include them.
- If possible, also include key error output in text form so it can be searched for.
- Try to edit log output only minimally (if at all) so that it can be ran through analyzers / formatters by those trying to help you.