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  • Writer's pictureTek Siong, Hock

Let's encrypt certbot error - Unauthorized (Invalid Response)

The following are the possible root-causes for unauthorized invalid response error:

1. Port for HTTP 80 and SSL 443 is not open

Use the port scanner (eg, to scan for the both port. If the port 443 is blocked,

a) There could be a firewall in the domain hosting provider that is blocking port 443 for acme challenges.

b) Nginx configuration /etc/nginx/site-enabled does not include the SSL port 443.

2. Try uninstall the nginx and reinstall it and run the following certbot command.

sudo apt install certbot python3-certbot-nginx

sudo certbot --nginx -d <domain> --noninteractive --agree-tos --email --redirect

Good luck!

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