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License Activation Failed | license_error.HttpsError / DNS Security Issue

Discussion in '3CX Phone System - General' started by litebit, Jan 1, 2017.

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  1. litebit

    Jan 1, 2017
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    I've a few questions around this issue :
    - I've installed Elastix 5 on a test machine, that test machine has normal access to the internet like all other machines in our network
    - we have a secured and strict DNS infrastructure.
    - all LAN machines have access to our internal DNS, which in its turn has amongst others, the google DNS as upstream.
    - no machine is allowed direct access to outside DNS servers

    on the elastix test machine, all normal (OS level) DNS tests pass, and a check from that machine, does resolve your servers :
    (your ISO build is missing the nslookup command)
    erp.3cx.com (
    activation.3cx.com (

    So the questions are :
    - why do I still get the license error?
    - why is your software forcefully trying to bypass our internal DNS servers, and try to use Google DNS ?
    -- a tcpdump seems to explain that your software only queries the google dns servers for activation.3cx.com, and when there is no answer from Google DNS, the whole process stops
    - even adding activation.3cx.com to the hostsfile with the correct IP does not work.

    Can you explain why Elastix5 is behaving like this?

  2. GiannosC_3CX

    GiannosC_3CX Guest

    Dear litebit,

    Are you using a proxy server to get online? Do you have deep packet inspection on your firewall?

    If yes, you need to add on trusted list our servers (erp & activation) to avoid deep packet inspection. also you need to remove the proxy on 3cx Phone system in order our server reply your request. This necessary so ssl communication is not altered.
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