Hi! I have Front-End and Back-End Exchange 2003 with SP1. On Front-End I have installed RPC Proxy and deployed RPC-HTTP on both of Exchange servers.. You know, Front-End (also RPC Proxy) searches automatically for ports on Back-End Exchange and registered them under ValidPorts registry key. But I do not want that Fron-End search theses ports automatically. I want to modify them manually. How can I disable automatically valid port search on Front-End (RPC Proxy)? Best Regards Mustafa