The page is available only when the PHP plugin is enabled. The plugin is not bundled with IntelliJ IDEA, but it can be installed from the JetBrains plugin repository as described in Managing plugins.
On this page, enable, disable, and re-configure your access to debugging PHP applications in the multiuser mode via an Xdebug proxy server.
In this field, specify the name for the Proxy server to identify connections from your IDE. This should be the value of the
In this field, specify the host on which the Xdebug proxy server resides.
In this field, specify the port which IntelliJ IDEA will listen to during a proxy debugging session.