The following error is seen when installing, onto RHEL 6.7, DP 9 from the DP DVD...
"The required xinetd or inetd daemon is not installed on the client system..."
A possible example solution...
See if xinetd is running
`ps -elf | grep -i xinetd`
See if xinetd is installed
`rpm -qa | grep -i xinetd`
In this case xinetd was not running or installed
To see if xinetd is available to install
`yum search xinetd`
In this case the following was received...
"Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
============================= N/S Matched: xinetd ==============================
cvs-inetd.noarch : CVS server configuration for xinetd
xinetd.x86_64 : A secure replacement for inetd
Name and summary matches only, use "search all" for everything."
So in this case xinetd was available. To install it...
`yum install xinetd.x86_64`
After this it was possible to install the DP 9 software.