What happens if dynamic IP changes?

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: mymachine.twilightparadox.com

My web server is (include version): standalone

The operating system my web server runs on is (include version):debian 10.4

I can login to a root shell on my machine (yes or no, or I don't know): yes

I'm using a control panel to manage my site (no, or provide the name and version of the control panel): no

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): 0.31.0

If my dynamic IP changes, will that "break" tls, so a new certificate is needed ASAP?

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No, it won't influence existing certificates. There is no relation between the IP address used for authorization of a previous certificate and Let's Encrypt certificates.

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"What happens if dynamic IP changes?"

If you wish to continue serving that domain, you will need to update the DNS entry for that name.
[or, although your site still has a valid cert for that name, no one will be able to find your server]

So if you are using dynamic IPs, you should use something like a Dynamic DNS service to automatically update the IP for your domain name.

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Thank you to both of you. I am set up with a Dynamic DNS service that checks & updates every 30 minutes. So it is possible for my server to be down for around 30 minutes. What I was wonderingI was if I would need a new certificate after that time was up. But it sounds like it should work fine. My IP hasn't changed in 2 years anyway.

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Yes.
The cert only has name(s) on it.
The names are resolved via DNS.
The Dynamic DNS service is there to update DNS for you should the IP change.

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What, if any, dynamic DNS service are you using?

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FreeDNS. Simple and no issues. Good support.

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