A bit more info. Using wireshark during the communication exchange, the client 
begins the SSL handshake with a  'Client Hello', the wireshark Secure Sockets 
Layer information is below:
Secure Sockets Layer
    SSL Record Layer: Handshake Protocol: Client Hello
        Content Type: Handshake (22)
        Version: TLS 1.0 (0x0301)
        Length: 135
        Handshake Protocol: Client Hello
            Handshake Type: Client Hello (1)
            Length: 131
            Version: TLS 1.2 (0x0303)
            Random
            Session ID Length: 0
            Cipher Suites Length: 4
            Cipher Suites (2 suites)
                Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 (0xc02b)
                Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)
            Compression Methods Length: 1
            Compression Methods (1 method)
            Extensions Length: 86
            Extension: server_name
            Extension: status_request
            Extension: elliptic_curves
            Extension: ec_point_formats
            Extension: signature_algorithms
            Extension: renegotiation_info
            Extension: signed_certificate_timestamp
After this, it falls down. It appears the proxy may not be allowing the 2 
ciphers presented by the client? Why are only 2 presented?

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https://bugs.launchpad.net/bugs/1575386

Title:
  Proxy issue with 16.04

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