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doc.qt.io SSL cypher issue - cannot access with Firefox on EL6

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  • R Offline
    R Offline
    robinfs
    wrote on last edited by
    #1

    Hi

    Our developers have started reporting problems accessing https://doc.qt.io using Firefox 60 ESR on EL 6.10:

    An error occurred during a connection to doc.qt.io. Cannot communicate securely with peer: no common encryption algorithm(s). Error code: SSL_ERROR_NO_CYPHER_OVERLAP

    It looks like the site only supports two cyphers, neither of which are supported by the latest NSS on EL 6.10:

    • TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)
    • TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028)

    Is this intentional because it excludes anyone using Red Hat 6 / CentOS 6 / Scientific Linux 6?

    Rob

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    • K Offline
      K Offline
      Konstantin Tokarev
      wrote on last edited by
      #2

      Qt provides local documentation which can be used from Qt Creator or Assistant, it requires no Internet access at all

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      • R Offline
        R Offline
        robinfs
        wrote on last edited by
        #3

        Thanks for the reply. For sure I'll suggest that. I'm just hoping to alert someone of the possible misconfiguration of the docs.qt.io subdomain as enforcing SSL with only TLS 1.2 and 2 ciphers will probably prevent access from more platforms than just this case.

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        • R Offline
          R Offline
          robinfs
          wrote on last edited by
          #4

          It's been resolved with 2 extra cipher suites added :-)

          | ssl-enum-ciphers:
          | TLSv1.2:
          | ciphers:
          | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp256r1) - A
          | TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (dh 2048) - A
          | TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (secp256r1) - A
          | TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp256r1) - A

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