How to Fix FiveM Failed Handshake to Server Closed Connection

Many FiveM players encounter the frustrating error, "Failed Handshake to Server Closed Connection While Deferring". This issue can leave you unable to connect to your favorite roleplay servers, but rest assured, it is fixable with the right approach.

What Causes the Failed Handshake to Server Closed Connection Error?

This error usually stems from a few specific root causes:

1. Server Compatibility Issues: The error often arises if the server you are trying to connect to is running a different version of the game than your client. Mismatches in server build and game build can lead to handshake failures.
2. Network Configuration Problems: Firewalls, VPNs, or any network security measures can block or interfere with the data packets required for a proper handshake between your client and the server.
3. Corrupted Game Files: If your GTA V installation or FiveM files are corrupt, it might prevent a successful connection to the server.
4. Cache Issues: Cached data might be stale or corrupted, which can disrupt the authentication process when connecting to the server.

How to Fix Failed Handshake to Server Closed Connection

Follow these steps in order to address the specific issues related to this error:

1. Check Server Compatibility: Ensure that the server you are trying to connect to has the same game build as your FiveM client. Some servers may require you to switch to different game builds. You can use the build switcher in your FiveM installation folder to select the appropriate version. If you're unsure, ask the server staff for the correct build version needed.

2. Clear FiveM Cache: A corrupted cache can cause handshake issues. To clear your cache:

   • Open your FiveM application.
   • Press F8 to bring up the console.
   • Type delete cache and hit Enter. This will remove any corrupted cached files.
   • Restart FiveM and try connecting to your server again.

3. Adjust Firewall/Antivirus Settings: Sometimes, your firewall or antivirus software may prevent FiveM from connecting properly. Make sure to create exceptions for FiveM in your firewall and antivirus settings. Here’s how:

   • Navigate to your firewall settings.
   • Add an exception for the FiveM executable.
   • Ensure that TCP/UDP ports used by FiveM (generally 30120) are open and not being blocked.

4. Verify/Repair GTA V Files: A corrupted install of GTA V can also lead to this error. If you’re using the Rockstar Launcher or Steam, verify the integrity of your game files:

   • For Rockstar Launcher: Go to Settings > My Library > Select GTA V > Verify.
   • For Steam: Right-click GTA V in your library > Properties > Local Files > Verify integrity of game files.

5. Update Graphics Drivers: Outdated or corrupt graphics drivers can sometimes cause unexpected crashes. Ensure your GPU drivers are up-to-date by visiting the official website of your graphics card manufacturer (NVIDIA, AMD, or Intel).

6. Reinstall FiveM: As a last resort, reinstalling FiveM can often resolve persistent issues. Uninstall FiveM completely, ensuring all residual files are deleted, then download the latest version from the official FiveM website and reinstall it.

Still Crashing?

If you've followed these steps and are still experiencing the error, you might need to gather more information to seek help. Check the CitizenFX.log or your crash report located in the FiveM application folder. Post your findings on the Cfx.re forums to get tailored support from the community and developers.

Frequently Asked Questions

Q: Is this a ban?
A: No, this error doesn't indicate a ban from the server; it’s a connection issue related to server compatibility or network settings.

Q: Is my PC broken?
A: No, typically this error relates more to software issues than hardware problems. Your PC is likely functioning well if other games are running smoothly.

Q: Will reinstalling FiveM lose my data?
A: No, reinstalling FiveM will not affect your GTA V files or your saved data, but it is always wise to back up your configuration files if you're concerned.

Q: Does this affect a specific server?
A: It can; some servers require specific game builds or configurations in FiveM. Always check with server admins for requirements.