RPM based distro with SeLinux (Redhat, CentOS)
Apache Web Server
After adding a vhost listening on custom port, Apache is not reachable anymore.
Starting Apache from Console gives error:
(13)Permission denied: make_sock: could not bind to address 0.0.0.0:444
no listening sockets available, shutting down
You can decide if you wish SeLinux to be configured to allow Apache to open custom port (check the reference), you can permanently disable SeLinux if this is a low security system in '/etc/selinux/config', or you can just disable SeLinux temporarily with 'setenforce 0' and start Apache with 'zendctl.sh start-apache' so you can get back to your tasks and decide on permanent solution later.