Directadmin httpd failed start after upgrade on Centos 8

If you have upgrade your Directadmin apache and after that the apache failed to start.

Try below guide.

[root@mango custombuild]# cat /etc/redhat-release
CentOS Linux release 8.3.2011

This:

sed -i '/|UNIT_PROXY|/d' /usr/local/directadmin/data/users/*/httpd.conf
systemctl restart httpd

/usr/local/directadmin/directadmin p

And it should fix your problem