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Err_ssl_version_or_cipher_mismatch

How to Fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH. This error denotes a problem with the SSL/TLS version or cipher suite of a website’s SSL certificate.

This occurs in web browsers when there is an issue with the SSL/TLS handshake process during the establishment of a secure connection between the client (web browser) and the server.

This error indicates that the browser was unable to negotiate a compatible SSL/TLS version or cipher suite with the server.

Here are some common reasons why you might encounter this error:

  • SSL/TLS Version Incompatibility: The SSL/TLS version supported by the server is not compatible with the SSL/TLS version supported by the client’s web browser. For example, the server may only support newer SSL/TLS versions (e.g., TLS 1.2 or TLS 1.3) while the client’s browser is using an outdated version (e.g., SSL 3.0 or TLS 1.0).
  • Cipher Suite Incompatibility: The cipher suites supported by the server do not match those supported by the client’s web browser. Cipher suites are sets of cryptographic algorithms used to encrypt and decrypt data exchanged during an SSL/TLS connection. If the server and client cannot agree on a common cipher suite, the SSL/TLS handshake will fail, resulting in the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error.
  • Incorrect SSL/TLS Configuration: Misconfigurations in the SSL/TLS configuration on the server, such as specifying unsupported or deprecated protocols or cipher suites, can lead to compatibility issues with the client’s web browser.
  • Firewall or Antivirus Interference: Firewalls, antivirus software, or security plugins installed on the client’s computer may interfere with SSL/TLS connections by blocking certain cipher suites or SSL/TLS protocols, leading to protocol mismatch errors.
  • Network Issues: Problems with the network, such as packet loss, network congestion, or misconfigured routers, can cause disruptions in the SSL/TLS handshake process, leading to protocol mismatch errors.

To troubleshoot and resolve the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error, you can try the following steps:

  • Update the SSL/TLS configuration on the server to use modern, secure protocols and cipher suites supported by current browsers. Ensure that deprecated or insecure protocols and cipher suites are disabled.
  • Review the server logs for any errors or warnings related to SSL/TLS connections that could provide insight into the cause of the protocol mismatch error.
  • If SSL inspection features are enabled in firewalls or antivirus software, try disabling them temporarily to see if they are causing the problem.
  • Clear the browser cache to remove any cached SSL/TLS session data that may be causing issues with the SSL/TLS handshake process.
  • Try accessing the website from a different network or using a different internet connection to see if the problem is network-related.
  • If you are unable to resolve the error, contact the website administrator or your web hosting provider for further assistance in diagnosing and resolving the SSL/TLS protocol mismatch error

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