How to Fix ERR SSL VERSION OR CIPHER MISMATCH Error

The ERR SSL VERSION OR CIPHER MISMATCH error occurs when a browser cannot establish a secure connection with a website due to an SSL version or cipher mismatch. This guide provides key steps to help resolve this issue.

1. Check the SSL Certificate on the Website

First, ensure that the site has a correctly configured SSL certificate. You can use the SSL Labs Test tool to check for certificate errors and see which SSL versions and ciphers the site supports.

2. Update Your Browser

Older browsers might not support the latest SSL versions or ciphers. Updating your browser to the latest version can help resolve compatibility issues with modern SSL protocols.

3. Review SSL and Cipher Settings on the Server

If you manage the website, ensure the server is configured to support current SSL versions (typically TLS 1.2 and TLS 1.3) and modern cipher suites. SSL 2.0 and 3.0 are outdated and often cause compatibility issues.

4. Clear Browser Cache

Cached files may contain outdated SSL data, leading to errors. Try clearing your browser’s cache and reconnecting to the site.

5. Temporarily Disable Antivirus or Firewall

Some antivirus programs or firewalls may block connections due to their own SSL settings. Temporarily disabling them can help identify if they’re causing the issue. If it resolves the problem, adjust your antivirus settings to allow SSL connections.

6. Check Your Device's Date and Time Settings

Incorrect date and time settings on your device can interfere with SSL certificate validation. Make sure your device’s date and time are set accurately.