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SSL Certificate problems after update to Firefox 36

  • 4 replies
  • 1 has this problem
  • 37 views
  • Last reply by John99

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Since updating firefox to version 36, all 2048 bit SSL certificates for our client websites are no longer functioning and have the exclamation mark on the address bar. All previous versions of firefox are fine with the site. The site is chancerygroupplc.co.uk.

Any suggestions?

All Replies (4)

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Your issue seems a bit more complicated and requires more investigation. We're currently looking into it and we'll get back to you with more details ASAP. Please understand that escalations can take up to 72 hours for a response, but no longer.

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SHA 256? More information on this type of encryption:

The proposed maintenance:

If we cannot investigate there is a mailing list https://www.mozilla.org/en-US/about/f.../#dev-security-policy

Modified by guigs

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I can not even access chancerygroupplc.co.uk from developer edition.

Running a check on the site using

I see that it is using RC4 which is broken since 2013 See for instance

The site does work using Firefox Release, IE & Chrome. I discover the site appears to be used for secure collection of debts !!

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P.S. I note it is now a standards RFC https://tools.ietf.org/html/rfc7465

February 2015
Prohibiting RC4 Cipher Suites

Abstract

  This document requires that Transport Layer Security (TLS) clients
  and servers never negotiate the use of RC4 cipher suites when they
  establish connections.  This applies to all TLS versions.  This
  document updates RFCs 5246, 4346, and 2246.