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Thread: Man-In-The-Middle proxy?

  1. #1
    Join Date
    Aug 2011
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    Ubuntu 16.04 Xenial Xerus

    Man-In-The-Middle proxy?

    At work I access Internet via a proxy (BlueCoat, given the name of the proxy machine...). I have no problem accessing most sites through it, but for one site it doesn't connect and Firefox reports:
    Code:
    An error occurred during a connection to XXXXXXX.YYY. The server rejected the handshake because the client downgraded to a lower TLS version than the server supports. (Error code: ssl_error_inappropriate_fallback_alert)
    
        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.
    Name of site witheld to protect the innocent, but it is a 100% SFW site. Of course no problem accessing this site using a proxy-less network connection.

    Is the message above due to the proxy degrading the TLS encryption to a level it can understand, the "client" being the proxy here, because when the client is my Firefox in direct connection it appears to work.
    Warning: unless noted otherwise, code in my posts should be understood as "coding suggestions", and its use may require more neurones than the two necessary for Ctrl-C/Ctrl-V.

  2. #2
    Join Date
    Dec 2007
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    562

    Re: Man-In-The-Middle proxy?

    Sounds like the proxy needs to be upgraded to support the latest TLS. It probably hasn't had an software upgrade in a while.

  3. #3
    Join Date
    Aug 2011
    Location
    47°9′S 126°43W
    Beans
    2,172
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Man-In-The-Middle proxy?

    Ah, OK.
    Warning: unless noted otherwise, code in my posts should be understood as "coding suggestions", and its use may require more neurones than the two necessary for Ctrl-C/Ctrl-V.

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