Encrypt connection string

Hi all,

I am using the fallowing code to encrypt connection string in my web.config. It is working wel when working in local server(vwd 2010), but when I move the files to hosting server I am getting eror. Eny idea?

Configuration config = WebConfigurationManager.OpenWebConfiguration("~");
ConnectionStringsSection connsection = (ConnectionStringsSection)config.GetSection("connectionStrings");

connsection.SectionInformation.ProtectSection("DataProtectionConfigurationProvider");
config.Save();

stringipaddress;
ipaddress = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (ipaddress == "" || ipaddress == null)
ipaddress = Request.ServerVariables["REMOTE_ADDR"];