Proton VPN Error 0X43524F54 | Fixes to Try

September 10, 2025 Freddy Error Fix 0

The Proton VPN error 0x43524f54 is a general connection issue that can occur on various platforms, particularly when using the OpenVPN protocol.

It’s often related to an authentication failure, but it can also be triggered by a number of other factors.

Here’s what you can try, based on proven fixes for related errors:

Recommended Fixes to Try

1. Update & Reinstall Proton VPN

  • Ensure you’re using the latest version of the app—updates often fix bugs and server compatibility issues.

  • If already up-to-date, try uninstalling and reinstalling to repair any corrupted files.

2. Check Date, Time & Firewall Settings

  • Ensure your system date and time are correct—SSL and authentication rely on accurate timestamps.

  • Add Proton VPN to your antivirus/firewall exclusions to avoid blocked communications.

3. Switch VPN Protocols

  • Try switching from WireGuard to OpenVPN (TCP/UDP) or vice versa. This sometimes resolves authentication or connection issues.

4. Disable Kill Switch Temporarily

  • If enabled, turn off the Kill Switch or Permanent Kill Switch, restart the app, and reattempt the connection. Then you can re-enable it.

5. Test Different Servers

  • Try connecting to a different VPN server location—some servers may temporarily fail or experience issues.

6. Network Reset (for Windows)

  • If Windows is your platform and you’re seeing connectivity issues alongside the error:

    ipconfig /release
    ipconfig /flushdns
    ipconfig /renew
    netsh winsock reset
    netsh interface ipv4 reset
    netsh interface ipv6 reset

    This can help resolve local network conflicts, as noted by users reporting failed connections to Proton services.

Also Read : help.hulu.com/video-02 | How to Fix

What Others Have Experienced

Some users on Reddit reported losing connection to Proton services entirely after a Windows update—but regained access after resetting network settings or requesting a new IP from their ISP.

Summary Table

StepAction
1Update or reinstall Proton VPN
2Check and correct system date/time
3Add Proton to firewall/antivirus exclusions
4Change VPN protocol (WireGuard ↔ OpenVPN)
5Disable Kill Switch temporarily
6Try a different VPN server
7On Windows, reset network settings if relevant

Still Stuck?

If none of the above helps, your best next move is to contact Proton Support and provide them with a detailed bug report—include:

  • The exact error code (0x43524F54)

  • Your OS and version

  • Steps you’ve tried

  • Any relevant logs (via the app’s “Report an issue” feature)

Premium users may also benefit from live chat support for faster assistance.

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