Documentation
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Portal Context
This property specifies the path of the portal servlet context. This is needed because javax.servlet.ServletContext did not have access to the context path until Java EE 5.
Set this property if you deploy the portal to another path besides root.
Examples:
portal.ctx=/
portal.ctx=/portal
This property specifies the application server's HTTP port. This value should be different from the value in the property web.server.http.port. That property refers to the web server, this property refers to the application server. This property should only be set when the application server is sitting behind a web server like Apache. See http://issues.liferay.com/browse/LPS-17106 for more information.
portal.instance.http.port=
Set this property if the application server is served behind a proxy and a prefix needs to be added to the portal servlet context path. This prefix will also be added to static resources served by layout templates, portlets, and themes.
portal.proxy.path=