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The "SSL_ERROR_NO_CYPHER_OVERLAP" error in Firefox occurs when the browser is unable to establish a secure connection with a website due to a lack of compatible encryption algorithms. This error typically indicates a configuration issue on either the server or the browser side. Here are a few steps you can take to troubleshoot and resolve the issue:

Update Firefox: Ensure that you have the latest version of Firefox installed on your computer. Outdated browser versions may lack support for newer encryption algorithms.

Clear cache and cookies: Clearing your browser's cache and cookies can help resolve temporary issues that may be causing the error. To do this, go to the Firefox menu, select "Options" or "Preferences," navigate to the "Privacy & Security" tab, and click on "Clear Data." Make sure to select both cache and cookies options, then click "Clear."

Disable security software: Temporarily disable any security software, such as antivirus or firewall, that could potentially interfere with the SSL connection. If the error disappears after disabling the software, you may need to adjust its settings to allow secure connections.

Check date and time settings: Ensure that the date and time on your computer are set correctly. Incorrect system time can cause SSL errors. If necessary, update your system's date and time settings.

Disable TLS/SSL scanning: Some antivirus programs have TLS/SSL scanning features that intercept secure connections and perform additional security checks. These features can sometimes cause conflicts and SSL errors. Check your antivirus settings and disable any TLS/SSL scanning or interception features.

Enable recommended protocols and ciphers: In Firefox, you can adjust the SSL/TLS protocols and cipher suites to enable a broader range of compatibility. Here's how:
a. Type "about:config" in the address bar and press Enter.
b. Accept the warning message about warranty voiding.
c. In the search bar, type "security.tls.version" to find the protocol settings.
d. Ensure that the following settings are set to "true" (default):

e. Search for "security.ssl3" to find cipher settings.
f. Ensure that the following settings are set to "true" (default):
g. Close the tab or window to save the changes.
Reset Firefox settings: If the issue persists, you can try resetting Firefox to its default settings. This will revert any custom settings and preferences back to their defaults. To do this, go to the Firefox menu, select "Help," then "Troubleshooting Information." Click on the "Refresh Firefox" button, and follow the prompts to reset the browser.

If none of these steps resolve the "SSL_ERROR_NO_CYPHER_OVERLAP" error, it's possible that the website you're trying to access has an outdated or misconfigured SSL certificate. In such cases, it's best to contact the website owner or administrator for assistance in resolving the issue.

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