在调用 OpenIdRelyingParty.CreateRequest 之前尝试将此代码添加到您的网站:

Try adding this code to your web site before calling OpenIdRelyingParty.CreateRequest:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

在某些 Azure 配置中，这已被证明可以解决问题.

In some Azure configurations this has been shown to resolve the issue.