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Firefox appears to be blocking Youtube

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Trying to access youtube shows the following message:


Secure Connection Failed

An error occurred during a connection to www.youtube.com. SSL received a malformed Server Hello handshake message.

Error code: SSL_ERROR_RX_MALFORMED_SERVER_HELLO

   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.

Learn more…

Trying to access youtube shows the following message: Secure Connection Failed An error occurred during a connection to www.youtube.com. SSL received a malformed Server Hello handshake message. Error code: SSL_ERROR_RX_MALFORMED_SERVER_HELLO 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. Learn more…

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This could be a problem with the TLS 1.3 Early Data feature also known as Zero Round Trip Time Resumption (0rtt). You can try to set security.tls.enable_0rtt_data = false on the about:config page to disable this feature until this is fixed by Google or Mozilla to see if that helps.

See also:


Are you using 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 then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.

See "Firefox connection settings":


Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.

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