First of all in default apache listen on port 80..
1. check whether the apache running or not (#ps ax | grep httpd)
2. check on which port apache listening (#netstat -pnl)
3. check which port defined on apache configuration file
4. What do you mean by server manager and how did you defined this FQDN
5. check the following in server itself
http://localhost OR Remote within your network try this
http://apache-server-ipaddress