RedHat 9 is the distribution of Linux that Apache is running on, not the Apache version. Do you know which version of Apache you have? I don't use RedHat, so I don't know which version it ships with. (Look at the bottom of the error page, and if you have the server signature turned on in httpd.conf, it'll say something like "Apache 1.3.27 at
www.mydomain.com Port 80" or something similar.)