this is rhel or cent
SElinux is used !
did you also write the se rules ?
did you make a "apache" user ?
normally you would install the rpm using yum
yum groupinstall "Web Server"
----------------- or this command ---------------
yum install httpd
it is in the base default repo
this WILL set the firewal and include the SE rules
otherwise you need to manually set these
22 and 80 ARE Open by default
or are you using "8080" ?
what is set in the httpd.conf file ?
Both rhel and Cent have LONG and very EXTENCIVE documentation on installing and setting up apache
and apache has even MORE documentation on there web site