Trying run auto SSL and keep getting this error

[WebHostPro]

9:46:06 AM WARN The domain “domain.com” failed domain control validation: The system failed to fetch the <abbr title="Domain Control Validation">DCV</abbr> file at “<a href="Domain Name Registration and Web Hosting | Domain.com">Domain Name Registration and Web Hosting | Domain.com</a>” because of an error: The system failed to send an <abbr title="Hypertext Transfer Protocol">HTTP</abbr> “GET” request to “Domain Name Registration and Web Hosting | Domain.com because of an error: Size of response body exceeds the maximum allowed of 16384 .

I added the Comodo IP's in the firewall. Not sure what else to do.

It's a redirected domain. Meaning when they go example.com it redirects to sub.example.com. The SSL is for the sub.example domain though.

It's sub domain added as a full cPanel account.

 

[cPanelMichael]

Hello,

Are any custom Apache templates utilized in the /var/cpanel/templates/apache2 or /var/cpanel/templates/apache2_4 directories on this server? Also, is the Engintron application installed on this server (there was another thread where it was the culprit for this error)? If neither of those are the case, it's possible a redirect rule is directing requests to the DCV file to another file that exceeds 16-KiB response limit. Are any other rewrite rules configured for this domain name?

Thank you.