ssl_error_weak_server_ephemeral_dh_key Firefox v.40.0.2

ssl_error_weak_server_ephemeral_dh_key Firefox v.40.0.2

portal connection on port 443 (SSL) with Firefox v.40.0.2 gives me the following error

ssl_error_weak_server_ephemeral_dh_key

Is there a solution or work-around regarding this issue?

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