you been serious? its a lan device, not an internet device.
If the certificate changes (e.g. MITM) the user is still alerted anyway.
So you add existing cert of router to trust store.
No prompts.
If a MITM occurs or other change of cert, new prompt appears.
Given letsencrypt certs only last 3 months the renewals will be more work then whitelisting the cert, I whitelisted my router cert several months ago.
So an administrator is going to go to all the trouble of getting a trusted certificate authority just so they dont have to whitelist the cert on their local router?
VPN's may be a different thing, but remember these routers are for personal not commercial use.
for people who really want to do this then use a linux machine to host the domain for the cert generation.
Script on the router to call the cert script over ssh, and when complete scp the file back to router.
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