SSL Received a Weak Ephemeral Diffie-Hellman Key

Situation: Modern versions of Firefox and Chrome prevent access to HTTPS sites using an obsolete encryption cipher. This is done to prevent a logjam attack.

Workaround: As a workaround on Firefox, perform the following steps to regain access to those HTTPS sites, by disabling the obsolete ciphers:

  1. In a new tab, type or paste about:config in the address bar and press Enter. Accept the warning to be careful.
  2. In the search box above the list, type or paste dhe and pause while the list is filtered.
  3. Double-click the security.ssl3.dhe_rsa_aes_128_sha preference to switch it from true to false (disable Firefox from using this cipher)
  4. Double-click the security.ssl3.dhe_rsa_aes_256_sha preference to switch it from true to false (disable Firefox from using this cipher)
  5. Reload the site.
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