Companion 4.3.4 hangs on Windows 11- "Waiting for websrever / Unknown

[les3pe]

Make sure you're on the latest stable or beta build

• I have tested this on the latest stable or beta release

Is this a bug in companion itself or a module?

• I believe this to be a bug in companion and not a specific module

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Companion 4.3.4, Windows 11. Upgraded from Companion 2.1.3. Launcher starts. Status remains "Waiting for web server -Unknown". GUI never becomes available. Stream deck buttons remain blank. Companion never reaches running state.`

Steps To Reproduce

Install Companion 4.3.4 on Windows 11.
Launch Companion
Wait for Launcher to initialize.
Observe that the status remains "Waiting for web server -Unknown".
The web GUI never becomes available.
The Windows Event Viewer Log shows ID 1002 (Application Hang) for Companion.exe.
netstat confirms no process is listening on the configured Companion HHTP port 8000 or 8888 or 8484.

Expected Behavior

Companion should start normally, launch the embedded web server and make the GUI available.

Environment (please complete the following information)

- Companion Version:4.3.4.0
- OS: Windows 11, version 25H2 (build 26200.8655)
- Browser:149.0.7827.156, official build (64-bit)

Additional context

This is a production Windows 11 PC used weekly for live streamed church services.
The previous installation 2.3.1 functioned correctly with the same hardware (Stream Deck, Blackmagic ATEM Television Studio Pro 4K, PTZOptics cameras, and AJA Helo).
If there is a startup log, debug mode, or diagnostic procedure that would help identify where Companion hangs, I would happy to provide additional information.

[Julusian]

In C:\Users\Julus\AppData\Roaming\companion\logs (use your username), there should be some log files which will hopefully say something about htis

[les3pe]

Julian, I have attached the requested log files. As an update, I was able to restore our production system by moving the Stream Deck to a different Windows computer that is running Companion 3.0.0 and importing my saved .companionconfig file. That system is now operating correctly with the ATEM, HELO, and four PTZOptics cameras, so I have a working configuration for our Sunday service. The original computer continues to exhibit the startup hang with Companion 4.3.4. Please let me know if there are any additional logs, diagnostics, or tests that would be helpful. Thank you for your assistance. Lewis E. Sauerwein, PE

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On 06/26/2026 10:26 AM EDT Julian Waller ***@***.***> wrote: Julusian left a comment (bitfocus/companion#4286) #4286 (comment) In C:\Users\Julus\AppData\Roaming\companion\logs (use your username), there should be some log files which will hopefully say something about htis — Reply to this email directly, view it on GitHub #4286?email_source=notifications&email_token=BO3B3ZOWPKEBZYX5D4OHNZ35B2BYVA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOBRGA2DQMBSGEZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-4810480212, or unsubscribe https://github.com/notifications/unsubscribe-auth/BO3B3ZML6EX5GRRQYCRGJUD5B2BYVAVCNFSNUABFKJSXA33TNF2G64TZHMYTGMBXGA4DOMRYHNEXG43VMU5TINZUHAZDMMRZHA4KC5QC. Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS https://github.com/notifications/mobile/ios/BO3B3ZPVVAZPYJFONKAYM5D5B2BYVA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOBRGA2DQMBSGEZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG and Android https://github.com/notifications/mobile/android/BO3B3ZN57ITA2JYBBHNDBS35B2BYVA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTIOBRGA2DQMBSGEZKM4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA. Download it today! You are receiving this because you authored the thread.Message ID: ***@***.***>

[Julusian]

Unfortunately attachments don't work when replying by email