With Rebex FTP/SSL component you are able to connect to a custom port. Please try to run the following code to connect to port 1200 on your ftpServer:
try
{
Ftp ftp = new Ftp();
ftp.Connect("ftpServer", 1200);
ftp.Login("username", "password");
}
catch(FtpException ex)
{
Console.WriteLine(ex.ToString());
}
If the program above is not succesful, please send us the content of ex.ToString() from the catch block!
Thanks.