When NNLS is installed to a server that is already running Apache or Tomcat, these instances are disabled and the standard ports used by them are reassigned for use by NNLS versions of Apache and Tomcat.
After NNLS is installed, if you want to use the previously installed services, you must assign them new port numbers and re-enable them to run at boot time.
HINT: You can enable Apache to start at boot time using the run-level editor for the Linux distribution you are running.