Question
How do you resolve the:
There was a problem creating the (sub-)domain:
(XID $$$$$$) The system failed to lock the append-only (+a) file “/etc/apache2/conf/httpd.conf” (as EUID: 0, EGID: 0) because of the following error: Operation not permitted
error?
Answer
You will want to remove the append-only attribute on the server's “/etc/apache2/conf/httpd.conf” using the chattr command:
chattr -a /etc/apache2/conf/httpd.conf