Fails to create threads

[bandrefilipe]

I'm trying to setup it to run on my Raspberry, through Docker, but connections from outside my local network doesn't seem to work.
I have opened my ports and done port forwarding.
Also, I have registered a DDNS to point to my public IP and have a process to update my DDNS Record everytime my public IP changes.
yougetsignal.com says port 64738 is opened and accessible.

Here are some details...

Host system:

• Device: Raspberry Pi 4 (ARM64)
• OS: Ubuntu 24.04.1 LTS (64-bit)
• Kernel: Linux raspberry 6.8.0-1040-raspi #44-Ubuntu SMP PREEMPT_DYNAMIC Wed Sep 24 18:30:35 UTC 2025 aarch64 aarch64 aarch64 GNU/Linux
• Docker version: Docker version 20.10.8, build 3967b7d
• Network: LAN IP 192.168.15.2 (static), connected to router with public port forwarding enabled for TCP/UDP 64738.
• Dynamic DNS: managed via No-IP DUC container.
• UFW: inactive.

Container details:

docker run -d \
  --name mumble-server \
  --restart=unless-stopped \
  -p 64738:64738/tcp \
  -p 64738:64738/udp \
  -v ~/mumble-data:/data \
  -e MUMBLE_CONFIG_SERVERPASSWORD=********* \
  -e MUMBLE_CONFIG_USERS=24 \
  mumblevoip/mumble-server:latest

Container logs:

Setting config "serverpassword" to: *********
Setting config "users" to: '24'
ls: cannot access '/run/secrets': No such file or directory
Setting config "database" to: '/data/mumble-server.sqlite'
Setting config "ice" to: '"tcp -h 127.0.0.1 -p 6502"'
Setting config "welcometext" to: '"<br />Welcome to this server, running the official Mumble Docker image.<br />Enjoy your stay!<br />"'
Setting config "port" to: '64738'
Running Mumble server as uid=10000 gid=10000
"/data" has the following permissions set:
  drwxr-xr-x, owner: "UNKNOWN" (UID: 10000), group: "UNKNOWN" (GID: 10000)
Command run to start the service : /usr/bin/mumble-server -fg -ini /data/mumble_server_config.ini
Starting...
<X>2025-10-21 22:57:46.943 SSL: OpenSSL version is 'OpenSSL 3.0.13 30 Jan 2024'
<W>2025-10-21 22:57:46.944 Initializing settings from /data/mumble_server_config.ini (basepath /data)
<W>2025-10-21 22:57:46.946 MetaParams: TLS cipher preference is "TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:AES256-SHA:AES128-SHA"
<W>2025-10-21 22:57:47.446 ServerDB: Opened SQLite database /data/mumble-server.sqlite
<W>2025-10-21 22:57:47.446 ServerDB: Using SQLite's default rollback journal.
<W>2025-10-21 22:57:48.193 Performed initial PBKDF2 benchmark. Will use 4000 iterations as default
<W>2025-10-21 22:57:48.193 Generating new tables...
!! 10/21/25 22:57:48.225 /usr/bin/mumble-server: error: cannot create thread for timer:
   src/Ice/Thread.cpp:518: ::IceUtil::ThreadSyscallException:
   syscall exception: Operation not permitted
<C>2025-10-21 22:57:48.226 MumbleServerIce: Initialization failed: ::IceUtil::ThreadSyscallException
<W>2025-10-21 22:57:48.226 Murmur 1.5.735 running on Linux: Ubuntu 24.04.1 LTS [arm64]: Booting servers
<W>2025-10-21 22:57:48.283 1 => Password for 'SuperUser' set to '************'
<W>2025-10-21 22:57:48.353 1 => Server listening on 0.0.0.0:64738
<W>2025-10-21 22:57:48.373 1 => Generating new server certificate.
<W>2025-10-21 22:57:49.659 1 => Not registering server as public
<W>2025-10-21 23:05:33.634 1 => <0:(-1)> New connection: 192.168.15.10:51173
<W>2025-10-21 23:05:33.777 1 => <0:(-1)> Client version 1.4.0 (Microsoft Windows NT 6.2.9200.0 Microsoft Windows NT 6.2.9200.0: AcTools.MumbleClient/3637)
<W>2025-10-21 23:05:33.791 1 => Starting voice thread
<C>2025-10-21 23:05:33.791 QThread::start: Thread creation error (Operation not permitted)
<W>2025-10-21 23:05:33.804 1 => CELT codec switch ffffffff8000000b 0 (prefer ffffffff8000000b) (Opus 1)
<W>2025-10-21 23:05:33.818 1 => <1:0(-1)> Authenticated
<W>2025-10-21 23:16:18.464 1 => <1:0(-1)> Connection closed: The remote host closed the connection [1]
<W>2025-10-21 23:16:34.815 1 => <0:(-1)> New connection: 192.168.15.10:55529
<W>2025-10-21 23:16:34.948 1 => <0:(-1)> Client version 1.4.0 (Microsoft Windows NT 6.2.9200.0 Microsoft Windows NT 6.2.9200.0: AcTools.MumbleClient/3637)
<W>2025-10-21 23:16:34.966 1 => Starting voice thread
<C>2025-10-21 23:16:34.966 QThread::start: Thread creation error (Operation not permitted)
<W>2025-10-21 23:16:34.979 1 => <2:0(-1)> Authenticated
<W>2025-10-21 23:42:02.840 1 => <2:0(-1)> Connection closed: The remote host closed the connection [1]
<W>2025-10-22 01:45:39.651 1 => <0:(-1)> New connection: 198.XXX.XX.XXX:55538
<W>2025-10-22 01:45:39.673 1 => <0:(-1)> Connection closed: The remote host closed the connection [1]
<W>2025-10-22 01:46:34.316 1 => <0:(-1)> New connection: 198.XXX.XX.XXX:55618
<W>2025-10-22 01:46:34.337 1 => <0:(-1)> Connection closed: The remote host closed the connection [1]
<W>2025-10-22 02:13:09.767 1 => <0:(-1)> New connection: 198.XXX.XX.XXX:58009
<W>2025-10-22 02:13:09.791 1 => <0:(-1)> Connection closed: The remote host closed the connection [1]
<W>2025-10-22 02:17:59.763 1 => <0:(-1)> New connection: 198.XXX.XX.XXX:58409
<W>2025-10-22 02:17:59.783 1 => <0:(-1)> Connection closed: The remote host closed the connection [1]

and these messages left me wondering what's wrong:

• !! 10/21/25 22:57:48.225 /usr/bin/mumble-server: error: cannot create thread for timer:
• QThread::start: Thread creation error (Operation not permitted)

Any ideas?

[bandrefilipe]

As I was writing this, I got new connection attempts with new log messages:

<W>2025-10-22 02:50:30.636 1 => <0:(-1)> Client version 1.4.0 (Microsoft Windows NT 6.2.9200.0 Microsoft Windows NT 6.2.9200.0: AcTools.MumbleClient/3465)
<W>2025-10-22 02:50:30.812 1 => Starting voice thread
<C>2025-10-22 02:50:30.812 QThread::start: Thread creation error (Operation not permitted)
<W>2025-10-22 02:50:30.828 1 => <5:3(-1)> Authenticated
<W>2025-10-22 02:50:34.565 1 => <0:(-1)> New connection: 76.XX.XXX.XX:29971
<W>2025-10-22 02:50:34.593 1 => <0:(-1)> Connection closed: Error during SSL handshake: error:0A000102:SSL routines::unsupported protocol [13]
<W>2025-10-22 02:50:38.436 1 => <0:(-1)> New connection: 76.XX.XXX.XX:31211
<W>2025-10-22 02:50:38.456 1 => <0:(-1)> Connection closed: Error during SSL handshake: error:0A000102:SSL routines::unsupported protocol [13]
<W>2025-10-22 02:50:46.618 1 => <0:(-1)> New connection: 173.XX.XXX.XX:59136
<W>2025-10-22 02:50:46.640 1 => <0:(-1)> Connection closed: Error during SSL handshake: error:0A000102:SSL routines::unsupported protocol [13]
<W>2025-10-22 02:50:47.335 1 => <0:(-1)> New connection: 76.XX.XXX.XX:32525
<W>2025-10-22 02:50:47.354 1 => <0:(-1)> Connection closed: Error during SSL handshake: error:0A000102:SSL routines::unsupported protocol [13]
<W>2025-10-22 02:51:01.247 1 => <0:(-1)> New connection: 76.XX.XXX.XX:30776
<W>2025-10-22 02:51:01.270 1 => <0:(-1)> Connection closed: Error during SSL handshake: error:0A000102:SSL routines::unsupported protocol [13]
<W>2025-10-22 02:51:10.850 1 => <0:(-1)> New connection: 173.XX.XXX.XX:59145
<W>2025-10-22 02:51:10.872 1 => <0:(-1)> Connection closed: Error during SSL handshake: error:0A000102:SSL routines::unsupported protocol [13]
<W>2025-10-22 02:51:20.164 1 => <0:(-1)> New connection: 76.XX.XXX.XX:31182
<W>2025-10-22 02:51:20.185 1 => <0:(-1)> Connection closed: Error during SSL handshake: error:0A000102:SSL routines::unsupported protocol [13]
<W>2025-10-22 02:51:40.037 1 => <0:(-1)> New connection: 173.XX.XXX.XX:59156
<W>2025-10-22 02:51:40.058 1 => <0:(-1)> Connection closed: Error during SSL handshake: error:0A000102:SSL routines::unsupported protocol [13]
<W>2025-10-22 02:52:38.808 1 => <5:3(-1)> Connection closed: The remote host closed the connection [1]

[Krzmbrzl]

Hm... to me it appears as if some sort of permissions are not set up properly. For one, I am a bit confused about the ls error on /run/secrets and also by the fact that apparently the mumble-server user (UID 1000) seems to be unknown.