(ssl_error_weak_server_ephemeral_dh_key) error on a site (W764) (W764) - other machine doesn't have this error - avast/mcafee difference and w7 Prem H vs Pro

I've seen a lot of reports wbout connection fails for the ssl_error_weak_server_ephemeral_dh_key. This happens to me on a website (municipal library) and ONE of my 2 machines of W7.
Does not work for W7/64 with McAfee and W7Pro
Succeeds on W7/64 with Avast and W7 Home Premium

Just started failing in the last 2 weeks.

I tried to read patches, but the information was sparse. I can get around a computer, but I don't know a lot about the structure of FF and I need a detailed method. More there are warnings about "dead ends". I go back to a single machine works and there is no. 39.0 running and parameters are the same, as far as I can tell - I even tried to analyze the troubleshooting information.

Thank you

You can compare the Pref settings involved.

  • Security.SSL3.dhe_rsa_aes_128_sha
  • Security.SSL3.dhe_rsa_aes_256_sha

Note that the DHE cipher suites have been disabled for some reason and their reactivation will make you vulnerable to the attack of the impasse.
You should consider using a separate with the two involved cipher suites enabled profile and use this profile to access the blocked sites.

Tags: Firefox

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