阿里云window2012 iis8.0，阿里云说默认就是 TLS1.2，我的机器默认居然是1.1，气死人啦。
搞了半天，又是改注册表又下工具，还重启了服务器，终于搞成1.2啦。
https://forums.iis.net/p/1235606/2130752.aspx
With that patch installed, you can enable .NET Framework 3.5 support of TLS 1.2. However, the ciphers to use are still determined by Windows itself, and you should use tools such as https://www.nartac.com/Products/IISCrypto
下载工具 IIS Crypto，只选择TLS1.2
另外还改了注册表，不知道是不是有用
https://support.microsoft.com/en-hk/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-a-default-secure-protocols-in