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"SSL_ERROR_RX_RECORD_TOO_LONG" only on firefox browser

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Hi My website receives this error sporadically but almost everyday when I open it via firefox:


"Secure Connection Failed

An error occurred during a connection to flashsystem.ir. SSL received a record that exceeded the maximum permissible length.

Error code: SSL_ERROR_RX_RECORD_TOO_LONG

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the web site owners to inform them of this problem."


And I can open it using other browsers with no issue at the same time, this will affect on my website traffic for firefox users, any solution ?

Hi My website receives this error sporadically but almost everyday when I open it via firefox: "Secure Connection Failed An error occurred during a connection to flashsystem.ir. SSL received a record that exceeded the maximum permissible length. Error code: SSL_ERROR_RX_RECORD_TOO_LONG The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the web site owners to inform them of this problem." And I can open it using other browsers with no issue at the same time, this will affect on my website traffic for firefox users, any solution ?

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Do you use a Proxy or VPN?

You can check the connection settings.

  • Settings -> General -> Network: Connection -> Settings

If you do not need to use a proxy to connect to internet, select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

  • switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window