Renegotiation is not allowed on this SSL socket. (Error code: ssl_error_renegotiation_not_allowed)

Troubleshooting:

Renegotiation is not allowed on this SSL socket.
(Error code: ssl_error_renegotiation_not_allowed)

To solve this problem we open Firefox and type about:config and search this line:

security.ssl.allow_unrestricted_renego_everywhere__temporarily_available_pref

Finally set it to TRUE like in the below screenshot.