```
$ # Replace authenticator = standalone by authenticator = webroot
+$ # Add webroot_path = /var/www/certbot
$ sudo vim /etc/letsencrypt/renewal/your-domain.com.conf
```
### TCP/IP Tuning
-A lot of your instance's raw performance is dependent on a properly tuned machine and more specifically, reverse-proxy. We provide support for Nginx and spent a lot of time putting sane defaults in it, but we strongly advise you to follow up with instructions in https://github.com/denji/nginx-tuning as needed.
-
**On Linux**
```