Searched and found this link. https://blog.configserver.com/?page_id=1995
After entering the command, I get a return to prompt with no output.
OS is CENTOS 6.8 standard v66.0.22
tried CSF -u got this
root@chaos [~]# csf -u
Oops: Unable to download: Can't connect to download.configserver.com:443 (timeout)
Configserver opens with blank Cpanel Main Page
Re: Configserver opens with blank Cpanel Main Page
Send us your server's IP address in an email to sales@waytotheweb.com and we'll check if it's blocked in the firewall.