View Webmail Zimbra Muncul Error Weak Ephemeral Diffie-Hellman Key

Ketika membuka webmail Zimbra, muncul error berikut:

Secure Connection FailedAn error occurred during a connection to Server Zimbra. SSL received a weak ephemeral Diffie-Hellman key in Server Key Exchange handshake message. (Error code: ssl_error_weak_server_ephemeral_dh_key)    The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.    Please contact the website owners to inform them of this problem.

Menurut penjelasan dari punggawa excellent yaitu kang Vavai, permasalahan ini bukan disisi Zimbra, melainkan di sisi Mozilla Firefox. Apabila mengalami kondisi tersebut, ada solusi dibawah ini yang bisa dicoba terapkan.

Hal ini juga dijelaskan oleh support Mozilla.

Workaround for Firefox 39 and above:
1) In FireFox, enter "about:config" in the URL field and press enter.
2) Accept the "This might void your warranty!" warning :)
3) In the search field at the top, enter "security.ssl3.dhe_rsa_aes"
4) Double click each result (128 and 256) to toggle the Value to "false"
Now retry your site - it should work now. Remember to change these settings back when you're done.

sumber: 

excellent community

https://support.mozilla.org/en-US/questions/1066238