In *Nix-land, you have to be a super-user to bind to a socket (I'm just guessing the same is true in Win32 land). If you look at the *Nix command ping, it is suid root and that's why Joe User can use it. I'm guessing but if you look at the perms for your NT version of ping and give your perl script the same perms, it should work.
-derby
update: that should be you may have to be super-user to bind to a socket (depends on the port number). If you do not have access, bind should return an EACCES error.
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