I ran this command: 1) certbot certonly
2) Chose webroot option
3) entered tahazsh.com
It produced this output: An unexpected error occurred:
There were too many requests of a given type :: Error creating new authz :: too many failed authorizations recently: see https://letsencrypt.org/docs/rate-limits/
My web server is (include version): nginx/1.6.2
The operating system my web server runs on is (include version): Ubuntu/14.04.1 LTS
I can login to a root shell on my machine (yes or no, or I don’t know): yes
This means you are having too many failed authorizations for this hour. You should be able to request / renew the certificate now.
However, since you are having autorization issues, i highly suggest you to use --staging (which use staging server) first and resolve the issues, then use regular webroot.