In the configuration file /etc/httpd/conf/httpd.conf, the “Listen” directive tells the server to accept incoming requests on the specified port. Multiple “Listen” directives may be used to specify a number of ports to listen to.
Port numbers 80, 88 and 98, in this example, are the ports that httpd would listen to. To make this change effective, restart the httpd service:
# service httpd restart
ou can verify that httpd is listening on all three ports with the command netstat:
# netstat -anp | grep httpd
tcp 0 0 :::80 :::* LISTEN 5278/httpd
tcp 0 0 :::88 :::* LISTEN 5278/httpd
tcp 0 0 :::98 :::* LISTEN 5278/httpd
If your output is similar to the above, the httpd web server is configured to listen on the specified ports. If your browser can not connect to these ports, check the firewall settings on the server or intermediate servers between the client and the httpd server.