ftp through gprs connection

[rinoesc]

hi,

I'm developing a ftp application for windows mobile using visual studio 2008 and opennetcf library.
I have a problem creating the connection to ftp server. I can connect to grps but after that, when I try to create the connection to ftp, I got this error:

NotSupportedExc eption
at
System.Net.WebR equest.Create(U ri requestUri, Boolean schemeOnly

the code is:

FtpWebRequest cerere = FtpWebRequest.C reate("ftp://" + ServerAddress + "/") as FtpWebRequest;
cerere.Credenti als = new NetworkCredenti al(UserName, Password);
cerere.KeepAliv e = true;
cerere.Binary = true;
cerere.Passive = true;

Thank you very much.