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If you ever get the above error message from a (SAP) webservice…this might fix it (at this in the generated proxy).

protected override System.Net.WebRequest GetWebRequest(Uri uri)
        {
            System.Net.HttpWebRequest webRequest = (System.Net.HttpWebRequest)base.GetWebRequest(uri);
            webRequest.KeepAlive = false;
            webRequest.PreAuthenticate = true;
            webRequest.ProtocolVersion = System.Net.HttpVersion.Version10;
            return webRequest;
        }