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Randomly losing audio output from all users in channel #3062
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Originally created by @Shaddycat on GitHub (Oct 25, 2025).
Description
My wife and I run Linux (OpenSUSE and Mint) and have both encountered an issue with Mumble where randomly one of us will stop receiving audio output from all users within a channel. The solution is to disconnect from the server and reconnect.
Noticeably, our friend who joins us runs Windows 11 and has experienced no such issue.
Steps to reproduce
Mumble version
No response
Mumble component
Client
OS
Linux
Reproducible?
Yes
Additional information
No response
Relevant log output
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@Krzmbrzl commented on GitHub (Oct 25, 2025):
This sounds as if there was a UDP issue on the client-side...
When this happens, do any of the indicator lights still light up? Does your own indicator light up when you talk during times when this happens?
@Shaddycat commented on GitHub (Oct 26, 2025):
None of the indicator lights for other users light up, but my own indicator light does.
@Krzmbrzl commented on GitHub (Oct 26, 2025):
Do others still hear you, when you don't hear them?
@Shaddycat commented on GitHub (Oct 26, 2025):
They can still hear me
@Krzmbrzl commented on GitHub (Oct 27, 2025):
Hm. Do you get any kind of message in Mumble's chat window about a switch from UDP to TCP?
And can the same problem be reproduced on a different server?
@Shaddycat commented on GitHub (Oct 29, 2025):
I don't get any messages or see any notification anywhere when it occurs. I have no way of knowing when it's happened until one of them messages me and says they're responding to me but I don't seem to hear them.
I haven't tested in another server, so let me run some tests elsewhere and see what happens.
@Shaddycat commented on GitHub (Oct 31, 2025):
Well I've tested on another server for an extended duration of time and didn't encounter the problem, so the issue must be on my server. I guess I wouldn't know what the cause is though. Nothing in the mumble logs.
@Krzmbrzl commented on GitHub (Nov 1, 2025):
Which version of the Mumble server are you using?
One thing to check would be whether forcing Mumble to use TCP for audio resolves the problem. In order for that to work, you would have to use a firewall to block all UDP traffic on your client machine. That should cause the client to switch to TCP mode, which in turn should make the server switch as well.
@Shaddycat commented on GitHub (Nov 1, 2025):
Looks like I'm on 1.3.0. This is from the official Ubuntu "mumble-server" apt package.
I'm suspecting first I should update the server to the newest version before I try anything else. 1.3.0 is very old by this point. I don't see a Linux server release in the latest releases though.
@Krzmbrzl commented on GitHub (Nov 1, 2025):
Unfortunately, we don't have any Linux packages (yet). However, you can obtain the latest server version from Doclerhub.
It's unclear whether this will actually fix the issue but I believe it's certainly worth a shot.
@Shaddycat commented on GitHub (Nov 3, 2025):
The update didn't fix it, so I will test with TCP instead of UDP. Is there any reason I can't just use the tick box in the settings to force TCP mode?
@Krzmbrzl commented on GitHub (Nov 4, 2025):
I'm not 100% sure whether this will also cause the server to switch to TCP (as I believe the client keeps sending UDP pings). But it would certainly be a good start to just try that (and then monitor for Mumble UDP packets)
@floyd-fuh commented on GitHub (Nov 13, 2025):
Just wanted to add a +1, me too. I have the issue for longer than 3 weeks. I would have opened a new issue because I'm on MacOS, but the symptoms are identical so I thought I leave it here.
Identical symptoms:
Differences:
Thanks a lot for the Server hint!
I guess we're going to downgrade the Linux Mumble server for now and check if that helps.
Let me know if you would like me to look into Wireshark or such...
One speculation: Maybe people start to migrate from Debian 12 to 13 (like us) and therefore installed Mumble server version v1.5.735 that has this issue... but can't confirm that yet.
@Shaddycat - Can you check which version the server is running on (in the client go to Server - Information) that has no issues with the audio?
@Krzmbrzl commented on GitHub (Nov 13, 2025):
Please report back on whether this made any difference.
Did the problem only start appearing after the switch?
It'd be amazing if you could check UDP packets between the server and your client. Specifically, whether there are any UDP packets that the server sends to your client but your client doesn't receive any of them
General questions:
@floyd-fuh commented on GitHub (Nov 17, 2025):
Yeah our admin has to find a time slot for the downgrade... let's hope it's happening this year... 😄
Unfortunately we don't know for sure because we can't remember the dates precisely. But I checked some logs and I guess we also had problems before the change, but not 100% sure.
Just confirmed with Wireshark, UDP packets are incoming and outgoing. The network is not the problem. The client is not outputting the audio apparently.
No positional audio, just regular communication (no plugins, no games)
Yes (also make sense as the UDP packets are going out)
@Shaddycat commented on GitHub (Nov 27, 2025):
Update: I changed my client to force use TCP and haven't experienced the issue since. It has been probably about two weeks of testing every other day on average. My wife did not make the change and continued to experience it. I have changed her over two days ago, no issue yet. But the test duration is too short I think to confirm anything on her end.
If forcing TCP fixes it, what would be recommended to get UDP working instead?
@Krzmbrzl commented on GitHub (Dec 12, 2025):
That depends on the reason why UDP doesn't work. And I have no idea why that might be the case...
@tparikka commented on GitHub (Dec 30, 2025):
I've been running into similar issues on my MacBook.
Client Side:
Server Side:
When I'm on Windows, I don't run into any issues at all. This issue only presents on my MacBook Air. It comes and goes - I'll be hearing audio fine and then it'll drop for minutes at a time. I won't see any indications in the client of anyone speaking.
@tparikka commented on GitHub (Jan 10, 2026):
Are there any kinds of diagnostics I could either obtain myself or request from my server admin to help in tracking this issue down?
@Krzmbrzl commented on GitHub (Jan 11, 2026):
I guess classic UDP connectivity debugging suggestions apply (log incoming and outcoming packets on client and server to see where the issue lies - presumably the client but this would make sure) and then trying to figure out the reason for that. I have never done something like that before, so I can't really give good advice on how to go about this 👀
@tparikka commented on GitHub (Jan 11, 2026):
I’ve tried it in TCP mode and run into the same issues, so I’m not sure it’s UDP specific.
@Krzmbrzl commented on GitHub (Jan 11, 2026):
Hm, then your issue seems to be different from the one discussed in this thread… You could try whether you are still able to
pingthe machine hosting the Mumble server when you encounter this issue. If that's the case, please open a separate issue here. If you can't ping during the times you don't hear anything, then it seems like some sort of network interruption (maybe try a wired connection if you are currently using WiFi)