Adding a Virtual Host Definition
If you want to access WebSphere Portal using a host name and port different from your Web server default (i.e port 80), add the required virtual host definition using the WebSphere Application Server administrative console.
Select Environment > Virtual Hosts.
Select the default_host entry or the entry for the virtual host that is being used to access the WebSphere Portal application.
Select Host Aliases, and verify whether there is a host name and port entry corresponding to the values used to access WebSphere Portal (for example, *:10039). Select New, and enter the information for the host name and port you want to use. (In the example below port 81 was added.)
Save your changes.