突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,是因为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,所以就会报错.并且在更新后又正常的问题, ServicePointManager.SecurityProtocol = SecurityProtocolType.SSL3;…
操作系统是Windows Server 2003 x64 SP2,使用Framework 4.0,在使用WebClient访问某些特定的HTTPS站点时,会引发异常: Unhandled Exception: System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Authentication…
最近做了一个安装包,安装包会弹出dotnet的 窗体,这个安装包会去调用https的一个api.用测试程序测试窗体都是好的.一旦打入安装包后,就报错.研究了半天,原来是https惹的祸 解决方案: .NET 4.6 and above. You don’t need to do any additional work to support TLS 1.2, it’s supported by default.DOTNET 4.6.1 以上版本,默认就可以了 .NET 4.5. TLS 1.2 i…
使用WebClient 发送https请求 使用WebClient发送请求时,并且是以https协议: WebClient webClient = new WebClient(); string result = webClient.DownloadString(url); error : The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure chan…
EX:The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. 这个是证书引起的.. 用IE浏览器访问接口,右击浏览器窗口,现在属性.查看证书. 应该是不可以的. 应该安装证书.…
写在前面 在模拟请求的时候,如果url为https的,会报这个错误.大概错误就是:基础连接已关闭:无法建立信任关系的SSL / TLS的安全通道. The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. 基础连接已关闭:无法建立信任关系的SSL / TLS的安全通道. 解决办法 在模拟请求的方法中加上这样一句话. ServicePoin…
