How do I fix: 🛑 Root Causes of the Error?

The primary reason for this error is that Filezilla server 1.5.1 only supports TLS V1.2, not TLS V1.3. This is a known limitation of the server and can be resolved by using a different version of the SSL/TLS protocol.Another possible cause could be the presence of an outdated or corrupted CA bundle

How do I fix: Using an alternative version of the curl executable?

Step 1: Download and install a newer version of the curl executable (e.g., 7.86.0 or later) which supports TLS V1.3.Step 2: Verify that the CA bundle is up-to-date and correctly configured to prevent any SSL/TLS protocol compatibility issues.

Software⏱️ 3 min read📅 2026-06-15

How to Fix: curl: (35) error:0A00010B:SSL routines::wrong version number

Q: How do I fix: 🚀 How to Resolve This Issue Using a compatible version of the Filezilla server?

Step 1: Update Filezilla server to a version that supports TLS V1.2 (or later) and lower versions of the SSL/TLS protocol.Step 2: Verify that the server is configured correctly and that the port 635 is accessible from the client machine.

curl: (35) error:0A00010B:SSL routines::wrong version number - How to fix

Quick Answer: Use the correct SSL/TLS version for the server, which is likely TLS V1.2 or lower.

📋 Table of Contents

🛑 Root Causes of the Error
🚀 How to Resolve This Issue
🎯 Final Words

The error 'curl: (35) error:0A00010B:SSL routines::wrong version number' occurs when using TLS V1.3 in passive mode with Filezilla server on port 635. This issue affects users who attempt to connect to the FTPS server using a non-standard version of the SSL/TLS protocol.

This error is frustrating because it prevents users from accessing their files over FTPS, and it can be difficult to diagnose without proper knowledge of the underlying issues.

🛑 Root Causes of the Error

The primary reason for this error is that Filezilla server 1.5.1 only supports TLS V1.2, not TLS V1.3. This is a known limitation of the server and can be resolved by using a different version of the SSL/TLS protocol.
Another possible cause could be the presence of an outdated or corrupted CA bundle in the curl executable, which may prevent it from connecting to the server with TLS V1.3.

🚀 How to Resolve This Issue

Using a compatible version of the Filezilla server

Step 1: Update Filezilla server to a version that supports TLS V1.2 (or later) and lower versions of the SSL/TLS protocol.
Step 2: Verify that the server is configured correctly and that the port 635 is accessible from the client machine.

Using an alternative version of the curl executable

Step 1: Download and install a newer version of the curl executable (e.g., 7.86.0 or later) which supports TLS V1.3.
Step 2: Verify that the CA bundle is up-to-date and correctly configured to prevent any SSL/TLS protocol compatibility issues.

🎯 Final Words

To resolve this issue, users can try updating their Filezilla server version to support a lower version of the SSL/TLS protocol or use an alternative version of the curl executable that supports TLS V1.3. Additionally, verifying the configuration and CA bundle used by both the client and server can help prevent compatibility issues.

Did this fix your problem?

If not, try searching for specific error codes.

🔍 Search Error Database

❓ Frequently Asked Questions

🛠️ Related Fixes

How to Fix: Pc crashes shortly after launching game (rainbow

Fix Pc crashes shortly after launching game (rainbow six siege). Compl

How to Fix: Installing an APK on a locked down phone

Installing an APK on a locked down phone: Try using a rooted device, e

How to Fix: New PC build- no signal and no clue

Fix New PC build- no signal and no clue. Complete troubleshooting guid