Issue :

How can you access cPanel like, say, http://domainname.com/xyz ? This is for security purposes.

Solution :

This can be done but not recommended as it would not be of much effect security-wise.
Even if you change it, cPanel/WHM would still run on the standard ports (2082/2083 & 2086/2087) which is known to everyone. If you have a valid cPanel license then you can contact their support and get the ports changed. This coupled with a strong password (change regularly) should be good enough.

However, coming back to the original question, you can achieve it in the following way :

Go to /usr/local/apache/conf/httpd.conf
Find the following line :

ScriptAliasMatch ^/?cpanel/?$ /usr/local/cpanel/cgi-sys/redirect.cgi

Comment it out by adding a ‘#’ at the beginning and add the following line below that line :

ScriptAliasMatch ^/?xyz/?$ /usr/local/cpanel/cgi-sys/redirect.cgi

Issue :

How to change the default port for SSH?

Solution :

Open the port (which you want to use for SSH) in the server firewall and restart the firewall to apply the change.
Then, open the configuration file /etc/ssh/sshd_config using your favorite editor and change :

#Port 22
to
Port x

Replace ‘x’ with the required port number.

Restart sshd :

/etc/init.d/sshd restart

We can achieve this by starting exim on the particular port (say 588) using the following command:

/usr/sbin/exim -oX 588 -bd

But to get this done automatically whenever exim starts, do the following:

1) In /etc/chkserv.d, add a file called exim_588 (to run it on port 588).

Note the underscore there. Do not replace it with hyphen as there is another file exim-26 that uses that. The content of the file would be:

service[exim-588]=588,QUIT,220,/etc/rc.d/init.d/exim stop;/etc/rc.d/init.d/exim stop;/etc/rc.d/init.d/exim stop;/etc/rc.d/init.d/exim start;/usr/sbin/exim -oX 588 -bd

2) Enable it in /etc/chkserv.d/chkservd.conf

exim_588:1

3) Now make the following changes in /etc/init.d/exim. Search for ALTPORT and add the following lines below that:

if [ "`echo $file | awk -F_ '{ print $1 }'`" = "exim" ]; then
ALTPORT2=”`echo $file | awk -F_ ‘{ print $2 }’`”
fi

Again search for it and add these lines:

if [ "$ALTPORT2" != "" -a "`grep \"daemon_smtp_port.* $ALTPORT2\" /etc/exim.conf`" = "" ]; then
echo -n “Starting exim-$ALTPORT2: ”
TMPDIR=/tmp $DAEMONIZE /usr/sbin/exim -bd -oX $ALTPORT2
echo $RESULT
fi

This will ensure that exim runs on port 588 on start. You can also see it enabled in Whm >> Service Manager.