@Override
    public void initialize( XMPPServer server )
    {
        super.initialize(server);

        proxyServiceName = JiveGlobals.getProperty("xmpp.proxy.service", "proxy");
        routingTable = server.getRoutingTable();
        router = server.getPacketRouter();

        connectionManager = new ProxyConnectionManager(getFileTransferManager(server));
    }
The default port of the file transfer proxy
xmppserver/src/main/java/org/jivesoftware/openfire/filetransfer/proxy/FileTransferProxy.java