I'm getting "Unable to connect to port 443"

This error is a bit misleading, while it is true, it is frequently not related to a firewall configuration for port 443, but instead that the device is not able to connect to the NTP servers (see the network requirements) to set the clock, which means that it cannot establish any HTTPS traffic.

The reason why this happens is because the Raspberry Pi does not have any Real Time Clock (RTC) built in. This means that when you power up the Raspberry Pi, it will not know what time it is without reaching out to the NTP servers.

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