We currently have a community chat website that is frequented by many people using VPN to bypass bans.
They use such services as [login to view URL] or Tor Exit nodes.
We want to have a system that will detect anybody using a VPN service or similar and not allow them to use our chat application.
We have several chat applications. One is built with flash, another with PHP, and a new one coming built with [login to view URL] and node.js.
I think the best thing to do would be to put this checker BEFORE logging into the chat room. We need to find an efficient way to implement this.
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I have a very good online script that we can embed in to php of your website, it will detect and simply block the proxy/vpn from iptables(linux). Let me know if you are interested