getting ERR_CERT_COMMON_NAME_INVALID Error? for a existing domain

[CGxperts]

few months ago, I added xyz.com and configured Lets Encrypt SSL, which worked well. But now, after 3 months, when the Auto SSL tried to renew it, it was showing that the hostname was ftp.xyz.com and that the SSL configuration was successfully completed. So, SSL got installed on ftp.xyz.com instead of xyz.com/www.xyz.com

How can I change the host name back to xyz.com instead of ftp.xyz.com?

(here I have replaced actual domain with xyz)

 

[zEitEr]

Hello,

So, SSL got installed on ftp.xyz.com instead of xyz.com/www.xyz.com

It might happen during a certificate renewal. Directadmin's script might throw away SANs which no longer resolves to your server's IP. If it happened, you will need to make sure all SANs resolves fine and re-request a new certificate with the desired SANs.