C# HTTPWEBREQUEST访问部分HTTPS网站一直超时

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C# HTTPWEBREQUEST访问部分HTTPS网站一直超时
设置了并发数目为500，关闭了request和response
ServicePointManager.DefaultConnectionLimit = 500;
ServicePointManager.Expect100Continue = true;
ServicePointManager.CheckCertificateRevocationList = false;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
这些都设置了，在一些电脑上依然无法访问https协议的内容，在自己电脑上又正常，但也不是每个https都不行，是微信网页版的https不行，直接把https改成http又没问题，很奇怪，求思路！