C# 如何使用.pem文件或（.crt和.key文件）执行RestSharp Get调用？

我有一个.crt文件和一个.key文件，我必须使用C#与rest调用一起发送。我在任何地方都能找到答案，有人建议将这些文件转换为单个.pfx文件，但问题是服务器不接受pfx。它接受.pem或同时需要.crt和.key文件。是否真的可以使用RestSharp发送.pem文件和get调用？我尝试使用以下代码，但响应总是显示“ACL拒绝连接”。提前感谢您的帮助

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您如何知道服务器不接受pfx的可能副本？

var client = new RestClient(@"https://midway-itg-stage.glb1.hpe.com/files/storeeasy/");

            //ServicePointManager.Expect100Continue = true;
            ServicePointManager.DefaultConnectionLimit = 9999;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12 | SecurityProtocolType.Ssl3;

            string certFile = @"C:\test_openssl.pem";
            X509Certificate2 certificate = new X509Certificate2(certFile,"file");
            client.ClientCertificates = new X509CertificateCollection() { certificate };
            //client.Proxy = new WebProxy();
            var restrequest = new RestRequest(Method.GET);
            //restrequest.AddHeader("Cache-Control", "no-cache");
            restrequest.AddHeader("Accept", "application/json");
            restrequest.AddHeader("Content-Type", "application/json");
            IRestResponse response = client.Execute(restrequest);
            Console.WriteLine(JsonConvert.SerializeObject(response));
            Console.WriteLine();
            Console.WriteLine();
            return response.Content;`