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ERR_SSL_VERSION_OR_CIPHER_MISMATCH and SSL_ERROR_NO_CYPHER_OVERLAP is an error that typically occurs when a web browser is unable to establish a secure connection to a website due to a mismatch in the SSL/TLS version or cipher suite being used.

This can prevent users from accessing the website and can be a frustrating experience for those trying to access the site.

The error occurs when a web browser attempts to connect to a website that is using an SSL/TLS version or cipher suite that is not supported by the browser. This can happen for a number of reasons, including:

  • The website is using an older version of SSL/TLS that is no longer supported by newer web browsers.
  • The website is using a cipher suite that is not considered secure and has been deprecated by web browsers.
  • The website is using a misconfigured SSL/TLS certificate that is causing the browser to reject the connection.

To fix the ERR_SSL_VERSION_OR_CIPHER_MISMATCH or SSL_ERROR_NO_CYPHER_OVERLAP error, there are several steps that can be taken:

  1. Update your web browser: Make sure that you are using the latest version of your web browser, as newer versions will typically support the latest SSL/TLS versions and cipher suites.
  2. Check the website’s SSL/TLS configuration: Contact the website administrator to ensure that the website is configured to use a secure SSL/TLS version and cipher suite. They may need to update their configuration to ensure that it is compatible with newer web browsers.
  3. Clear your browser’s cache and cookies: Clearing your browser’s cache and cookies can help to resolve the issue if the error is caused by a problem with the browser’s stored data.
  4. Disable SSL scanning or inspection in your antivirus software: Some antivirus software can interfere with the SSL/TLS connection, causing the error to appear. Disabling SSL scanning or inspection in your antivirus software may help to resolve the issue.
  5. Try accessing the website using a different web browser: If the website is not accessible with one browser, try accessing it using a different browser to see if the issue is specific to the browser you are currently using.
  6. Check your device’s date and time: Make sure that your device’s date and time are set correctly as this can also cause the issue if the certificate validation fails.
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In conclusion, the ERR_SSL_VERSION_OR_CIPHER_MISMATCH and SSL_ERROR_NO_CYPHER_OVERLAP error can be caused by a number of factors, including outdated web browsers, misconfigured websites, and interference from antivirus software.

By taking the steps outlined above, you should be able to resolve the issue and regain access to the website. It is important to note that website administrators should ensure that their website is configured to use secure SSL/TLS versions and cipher suites to avoid this error from occurring.

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