Solution to cPanel Lets Encrypt 400 Bad Request Error

If you receive the following error when you want to install free SSL with Lets Encrypt on one or more sites with Auto SSL in cPanel or when you want to extend the SSL date, the reason for the error is that the Lets Encrypt package used for cPanel is not up to date.

Http 400 Bad Request

We can fix the error using the following commands.

yum clean all
yum update cpanel-letsencrypt

Check by trying Auto SSL again.