Set an a record for a wildcart cert *.domain.com pointing towards your servers local IP such as 192.168.0.1, turn off cloudflare proxy
Go into NPM and setup the SSL cert using dns challenge and your api token
setup a proxy host user your subdomain.domain.com pointing towards your docker container
key step!!! make sure you do not have conflicting ports 80 and 443 on your machine. On unraid the device management ports are set to this, but for NPM to do local proxies, it needs access to these ports.
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If you want to use DNS challenge with Caddy it’s kind of annoying though (need to download/compile a separate version with the DNS plugin you need).
Which is probably a good idea if you don’t plan to expose the services publicly but want a real certificate to avoid self-signed cert warnings.
I’ve never had this issue but I run basically everything through docker and presumably it bundles this by default.