x509: certificate signed by unknown authority

[smssoleimani]

Welcome

• Yes, I'm using a binary release within 2 latest releases.
• Yes, I've searched similar issues on GitHub and didn't find any.
• Yes, I've included all information below (version, config, etc).

What did you expect to see?

Expected lego runs to register an account and install a certificate. Doing this on QNAP NAS.

What did you see instead?

$ lego --http --http.webroot "/share/homes/user" --email="[email protected]" --domains="domain.com" run                   
2022/01/05 21:16:16 Could not create client: get directory at 'https://acme-v02.api.letsencrypt.org/directory': Get "https://acme-v02.api.letsencrypt.org/directory": x509: certificate signed by unknown authority

How do you use lego?

Other

Reproduction steps

ssh to qnap
ports 80 and 443 are open

$ lego --http --http.webroot "/share/homes/user" --email="[email protected]" --domains="domain.com" run

Version of lego

lego version 4.5.3 linux/amd64

Logs

$ lego --http --http.webroot "/share/homes/user" --email="[email protected]" --domains="domain.com" run                   
2022/01/05 21:16:16 Could not create client: get directory at 'https://acme-v02.api.letsencrypt.org/directory': Get "https://acme-v02.api.letsencrypt.org/directory": x509: certificate signed by unknown authority

Go environment (if applicable)

No response