Please Go though my this link will solve your problem:-
If apache server is external please go through the link:
You configure an external web server connection by using the Web Server Configuration Tool, which you can run through a graphical user interface (GUI) or the command line. The Windows discussions describe GUI mode, and the UNIX instructions describe command-line mode; however, you can use GUI mode in UNIX if you have access to a graphical environment.
By this way we can even host more then one CF versions on one apache server