Proxy/firewall whitelist for Nitrokey HSM2 firmware update

Nitrokey HSM2 firmware can be updated via remote access to the external infrastructure.

Can this be done via the HTTP/HTTPS proxy? If yes, which domain names are used?
I need to whitelist the domain names used during the update process on my proxy to allow such access.

Updates are provided via The client validates the Let’s encrypt server certificate. You could add your intermediate certificate of a proxy if needed (working, but of course not recommended).

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