How to Fix ERR SSL VERSION OR CIPHER MISMATCH Error

Learn how to fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH in this tutorial.

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ERR_SSL_VERSION_OR_CIPHER_MISMATCH is an error that occurs when a site fails to provide a valid SSL/TLS certificate. Our video tutorial will cover six quick fixes to help you troubleshoot this error.
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📌 Handy Links
Troubleshooting ERR_SSL_VERSION_OR_CIPHER_MISMATCH:
https://www.hostinger.com/tutorials/s...
What Is TLS? Understanding Transport Layer Security and How It Works:
https://www.hostinger.com/tutorials/w...
ERR_SSL_PROTOCOL_ERROR: What It Is and 3 Effective Ways to Repair It:
https://www.hostinger.com/tutorials/e...
Qualys SSL Labs:
https://www.ssllabs.com/ssltest/analy...
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🕒 Timestamps
00:00 - Intro
00:15 - What is ERR_SSL_VERSION_OR_CIPHER_MISMATCH?
00:52 - Check SSL/TLS Certificate
01:52 - Disable the QUIC Protocol (Google Chrome)
02:34 - Clear Web Cache (Google Chrome)
03:07 - Clear SSL State (Windows)
03:44 - Enable TLS 1.3 Support (Windows)
04:25 - Temporarily Disable Antivirus
04:55 - Outro
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ERR_SSL_VERSION_OR_CIPHER_MISMATCH error happens if a website uses an invalid or outdated SSL/TLS certificate. This prevents the browser from validating the website’s SSL certificate to establish a secure connection.

Here are six ways to fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH:

📌 Check SSL/TLS Certificate
Use Qualys SSL Labs to validate your SSL/TLS certificate and identify potential errors.

📌 Disable the QUIC Protocol (Google Chrome)
QUIC is a web traffic protocol that can sometimes trigger the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error. Disabling it can fix the issue.

📌 Clear Web Cache (Google Chrome)
Deleting your browser cookies and cache can help remove old configuration data that might be causing the error.

📌 Clear SSL State (Windows)
Clearing SSL state on your operating system eliminates the need to remove each certificate on every page load.

📌 Enable TLS 1.3 Support (Google Chrome and Windows)
Make sure your web browser and operating system support the current TLS version.

📌 Briefly Disable Antivirus
Temporarily turn off your antivirus’ SSL/TLS scanning feature to check if that was causing the issue.
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