public int getProxyPort() {
        return PROXY_PORT.getValue();
    }
Returns the port of the proxy to use to connect to igniterealtime.org or -1 if no
proxy is being used.

@return the port of the proxy to use to connect to igniterealtime.org or -1 if no
        proxy is being used.
xmppserver/src/main/java/org/jivesoftware/openfire/update/UpdateManager.java