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The easiest way to work around the issues of a secure firewall is to connect the gateways before the secured portion (e.g. in a partitioned zone with full access). The Lora Gateways and Sensors use secure transmission and connectivity to communicate directly with each other (and not to other devices within your network) and so allowing them a direct connection to the Internet is a safe and easy path forward.
If your setup must enforce security behind a firewall and you need details on Ports to open, please refer to the below list of ports.
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