[Bug]: Cannot join voice channels...again

[Plootie]

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Verify Issue Source

• I verified the issue was caused by Discord.Net.

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Description

Recently I was affected by #3154 and had to jump to nightly builds to resolve the issue of joining voice channels.
Coming back to my bot today I am once again receiving The server sent close 4006: "Session is no longer valid." on connection to voice channels.

I have tried different voice regions, different nightly builds, latest stable release, different channels, different guilds. All show the exact same behavior. New issue or am I doing something wrong?

Version

3.18.0-nightly.20250822.614

Working Version

No response

Logs

System.Net.WebSockets.WebSocketException (0x80004005): WebSocket session expired
       ---> Discord.Net.WebSocketClosedException: The server sent close 4006: "Session is no longer valid."
         at Discord.Net.WebSockets.DefaultWebSocketClient.RunAsync(CancellationToken cancelToken)
         at Discord.Audio.AudioClient.OnConnectingAsync()
         at Discord.ConnectionManager.ConnectAsync(CancellationTokenSource reconnectCancelToken)
         at Discord.ConnectionManager.<>c__DisplayClass29_0.<<StartAsync>b__0>d.MoveNext()

Sample

IAudioClient audioClient = await voiceChannel.ConnectAsync();

Packages

Discord.Net 3.18.0-nightly.20250822.614
Discord.Net.Commands 3.18.0
Discord.Net.Interactions 3.18.0
libsodium 1.0.20.1
Microsoft.Extensions.Configuration 9.0.8
Microsoft.Extensions.Configuration.EnvironmentVariables 9.0.8
Microsoft.Extensions.Configuration.Json 9.0.8
Microsoft.Extensions.Configuration.KeyPerFile 9.0.8
Microsoft.Extensions.Hosting 9.0.8
SpotifyAPI.Web 7.2.1
YoutubeExplode 6.5.4

Environment

-OS: Windows 10 19045
-Architecture: x64
-SDK: .NET SDK 8.0.303

[Naquino14]

Having this issue currently as well.
See this comment: #3155 (comment)
The voice api is version 3 which is deprecated.

[cco]

I pulled the nightly library and verified I had the changes referenced in #3183. This issue still doesn't seem resolved. The only workaround as of now is switching to a region to outside the US, I chose Rotterdam which seemed to allow my bot to join as intended.

Edit: This may be have been a build process fluke from switching to nightly. If anyone else can do a clean build on nightly and let me know how it goes, that'd be great. It seems to work for now in US regions again.

[standleypg]

I had a similar issue. I’ve been using Discord.Net for almost three years, and while it worked great for a long time, I started running into several problems recently, from joining voice channels to the deprecated transport encryption modes. It looks like the package is no longer being actively maintained. I ended up migrating to NetCord, and it’s been superb so far. The migration process was also quite smooth.

[Misha-133]

The voice implementation was never actively maintained during these years. It is a huge time sink for a rarely used feature. There are higher priority things that should be worked on.

[Naquino14]

I had a similar issue. I’ve been using Discord.Net for almost three years, and while it worked great for a long time, I started running into several problems recently, from joining voice channels to the deprecated transport encryption modes. It looks like the package is no longer being actively maintained. I ended up migrating to NetCord, and it’s been superb so far. The migration process was also quite smooth.

Thank you for the suggestion. I may do the same for my bot.