My DNN 4.8.1 site has 128 child sites at the moment. Each child site "belongs" to a department within my institution.  Each department has its own acronym which is used to identify their site. 

My main portal is (example) http://www.Institution.edu/ - this is the main portal and has all of our instution-related stuff.  Each department has its own child site with a URL structure of http://www.institution.edu/department_acronym.  Links on the main portal take visitors to the departmental sites. 

I have a department whose URL is http://www.institution.edu/CCC and they want to change it to http://www.institution.edu/CCTC.  I went to the site settings and added an alias (now shows http://www.institution.edu/CCC and http://www.institution.edu/CCTC).  However, when I navigate to http://www.institution.edu/CCTC, I get a 404 page not found error.

What do I need to do to fix this?  The department wants both aliases so people can find them regardless of which URL is used.  Creating duplicate sites is not an option.  Forwarding is an option, but I do not know how to do this.

That worked perfectly!  Thank you for your help!