微信接口问题(The underlying connection was closed: An unexpected error occurred on a send)

忽然在调用微信接口是报：The underlying connection was closed: An unexpected error occurred on a send错误，跟踪了半天，是由于在调用阿里人脸识别接口时，接认证设置成了SSL3，而微信接口支持TLS,因此就会报错。而且在更新后又正常的问题，

ServicePointManager.SecurityProtocol = SecurityProtocolType.SSL3;