Knowledgebase: SSL Technical FAQs
Firefox error :-12263 SSL_ERROR_RX_RECORD_TOO_LONG
According to ( ) this error means

error :-12263 SSL_ERROR_RX_RECORD_TOO_LONG "SSL received a record that exceeded the maximum permissible length."

This generally indicates that the remote peer system has a flawed implementation of SSL, and is violating the SSL specification.

If you are using Apache2:

In the ports.conf file, make sure it looks like the following:

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Listen 80
Listen 443 https
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The https after the 443 tells Apache2 to use the SSL protocol on that port.

This is one thing to try. If the below does not resolve the issue we would recommend doing some more server side investigation.
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