Vs2010 C# the remote server returned an error: (400) bad request

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C#

The following code returned an error:(400) bad request:

sub = "https://www.sosyachting.com";
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(AcceptAllCertifications); 
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = (SecurityProtocolType)(0xc0 | 0x300 | 0xc00 | 0x30); //tls,tls1.1,tls1.2,ssl3
System.Net.WebClient wc = new System.Net.WebClient();
byte[] raw = wc.DownloadData(sub);
string webData = System.Text.Encoding.UTF8.GetString(raw);

AcceptAllCertifications is defined as:

public bool AcceptAllCertifications(object sender, System.Security.Cryptography.X509Certificates.X509Certificate certification, System.Security.Cryptography.X509Certificates.X509Chain chain, System.Net.Security.SslPolicyErrors sslPolicyErrors)
{
    return true;
}

I am using VS2010 c#, windows 7.

What I have tried:

The code incorporates every suggestion I have found on the internet. Any other ideas would be greatly appreciated.