not always the obvious things are true, mr.brainless :laugh:

sudhir.marni wrote: i cudnot run it . Why not? What happened? Best wishes, Hans [CodeProject Forum Guidelines] [How To Ask A Question] [My Articles]

hmm If we could change firewall settings programmatically then they would't be very secure. You didn't specify which settings you want to change but you could look into UPnP. Some firewall/NAT devices have UPnP support (although most secure networks don't enable it I imagine). If the firewall is the Windows Firewall on XP and your app is running with admin privileges then there's the Windows Firewall API as well. Mark "Do you know what it's like to fall in the mud and get kicked... in the head... with an iron boot? Of course you don't, no one does. It never happens. It's a dumb question... skip it." (Rex Kramer "Airplane!")

See here[^] if helpfuls WhiteSky

sudhir.marni wrote: to find out whether the service of particular port is available or not Well, that depends on what you mean. Let me make a couple of assumptions: - the port you're talking about is a port on a TCP connection - the service is something like a FTP-server or similar If you cannot sucessfully connect to the server socket you know that the port is unreachable and it's reasonable to assume the service to be down. If you're able to connect to the port of the server socket, then you have to use a suitable protocol for the service, such as HTTP, that will tell you whether the service is up'n'running or not. My point is that you need to know what protocol to use to be able to determine if the service is available or not. -- Roger "It's supposed to be hard, otherwise anybody could do it!" - selfquote "No one remembers a coward!" - Jan Elfström 1998 "...but everyone remembers an idiot!" - my lawyer 2005 when heard of Jan's saying above

sudhir.marni wrote: How can i restrict the binding of blocked ports I have no idea what that means sudhir.marni wrote: how can i find the which port is blocked. Check the firewall and/or proxy server settings. led mike

Open a socket on that port and send a hello signal. If the application is running, it should reply to caller with a standard string. AKA protocol. Figure out one for your internal use, just as HELO on port 25 is the SMTP greeting.