The primary reason for a 425 error in FileZilla Server is that the server's TLS (Transport Layer Security) certificate is not properly configured or has expired. This can cause issues with establishing a secure connection between the client and server.Another possible cause of a 425 error is that th

How do I fix: Check and update the SSL/TLS version?

Step 1: Check the supported TLS versions on your server by running the command `openssl s_client -version` or checking the FileZilla Server configuration files.Step 2: Verify that the client's TLS version is compatible with the server's version. If necessary, update the client to support a newer TLS

Software⏱️ 3 min read📅 2026-06-11

How to Fix: FileZilla Server refusing connection - 425 error

Q: How do I fix: 🔧 Proven Troubleshooting Steps Update or renew the TLS certificate?

Step 1: Check the expiration date of your server's TLS certificate and update it if necessary. You can use tools like OpenSSL to verify and renew the certificate.Step 2: Verify that the new certificate is properly configured on your server by checking the FileZilla Server logs for any error messages

FileZilla Server refusing connection - 425 error, possible solution.

Quick Answer: Check if TLS encryption is enabled and configured correctly.

📋 Table of Contents

⚠️ Common Causes
🔧 Proven Troubleshooting Steps
💡 Conclusion

The FileZilla Server is refusing connections with a 425 error, which affects users who are trying to upload files using FTPS (FTP over SSL/TLS). This issue can be frustrating for those relying on this service.

Fortunately, the issue can often be resolved by identifying and fixing the root cause. The steps outlined below will guide you through the process of troubleshooting and resolving the 425 error.

⚠️ Common Causes

The primary reason for a 425 error in FileZilla Server is that the server's TLS (Transport Layer Security) certificate is not properly configured or has expired. This can cause issues with establishing a secure connection between the client and server.
Another possible cause of a 425 error is that the server's SSL/TLS version is not supported by the client. FileZilla Server supports TLS versions 1.0, 1.1, and 1.2, but older clients may only support earlier versions.

🔧 Proven Troubleshooting Steps

Update or renew the TLS certificate

Step 1: Check the expiration date of your server's TLS certificate and update it if necessary. You can use tools like OpenSSL to verify and renew the certificate.
Step 2: Verify that the new certificate is properly configured on your server by checking the FileZilla Server logs for any error messages related to the SSL/TLS connection.
Step 3: After updating or renewing the certificate, restart the FileZilla Server service to apply the changes.

Check and update the SSL/TLS version

Step 1: Check the supported TLS versions on your server by running the command `openssl s_client -version` or checking the FileZilla Server configuration files.
Step 2: Verify that the client's TLS version is compatible with the server's version. If necessary, update the client to support a newer TLS version.

💡 Conclusion

By following these steps and identifying the root cause of the issue, you should be able to resolve the 425 error and restore FileZilla Server's functionality.

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