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Chrome ERR_SSL_PROTOCOL_ERROR

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Overview

Chrome ERR_SSL_PROTOCOL_ERROR means the browser cannot establish a secure SSL/TLS connection with the website.

Key Details

  • SSL/TLS handshake failed between browser and server
  • Cannot establish encrypted HTTPS connection
  • Site may have misconfigured SSL certificate
  • Different from certificate validity errors

Common Causes

  • Server SSL/TLS configuration is broken
  • Incompatible SSL/TLS protocol version
  • System clock is significantly wrong
  • Antivirus intercepting SSL connections

Steps

  1. 1Check your system date and time are correct
  2. 2Disable antivirus SSL scanning temporarily
  3. 3Clear Chrome SSL state: Settings > Security > Manage certificates
  4. 4Try accessing with different protocol: change https to http (not recommended for sensitive sites)

Tags

browserchromechrome err ssl protocol errorfixtroubleshooting

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Frequently Asked Questions

The connection could not be encrypted — avoid entering sensitive information.