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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, https://www.whatismyip.com/port-scanner/) 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 myemail@excelroot.com --redirect



Good luck!


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