By default, Tomcat is listening on the port number 8080 (for HTTP Connector) and 8009 (for AJP Connector), as shown in the following screenshot of Tomcat’s console when the server is started:
Sometimes, one needs to change these default port numbers because of conflict with other applications or just for convenience, e.g. change HTTP port number from 8080 to 80 in order to type the URL without specifying the number.
It’s very easy to change the port numbers in Tomcat, by doing the following steps:
<Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />
<Connector port="80" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />
See also: How to change port numbers for Tomcat in Eclipse