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  1. Hello, I am a AirVPN user and I like it very much. I have a question about the infrastructure of the AirVPN servers though. I have read in this forum that the VPN servers do not keep a database or any kind of user data, and instead send a message to a back-end server when a new VPN connection request comes in. The back-end server has a centrelized database on it, with a table of active_sessions among others, and the back-end server sends a reply back to the VPN server after checking some information (nr of sessions among others). This reply from the back-end server to the VPN server, basically has a ALLOW or DENY message, it is used to let the VPN server know if the VPN connection request should be allowed or denied. My question is this: does OpenVPN daemon software has the possibility to make use of external software (programs/scripts) during a connection request? So that when a connection request comes in, OpenVPN service forwards this request to an external script/program so that this external script/program can send a message to a back-end server? If it does not have this possibility, how are you sending a request to a back-end server? Or are you listening on the 80, 445 etc ports on the VPN servers by using a different daemon (not OpenVPN) software, and only after the query message forwarding the reply from the back-end to OpenVPN daemon? I hope you will be able to explain, because I am not sure that OpenVPN has this option by defuault. Thank you for your answer!
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