If I were you, I'd try to sniff traffic from the browser to the server and back, to see if the request is sent and what is it like. You could use a full-blown packet sniffer, like Ethereal with WinPCap, or a simple port redirector with logging (probably POE has something like this in its cookbook). I'd go with the first, but in Win32 you could (er - will) have problems sniffing packets in local, so be sure that the browser and the application are in distinct machines.