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今天访问我的CRM环境报错，AD FS登录页面输入用户名和密码登录后不会跳转到Dynamics 365 Customer Engagement的首页。
我看AD FS的日志有如下的报错：
Encountered error during federation passive request.
Additional Data
Protocol Name:
wsfed
Relying Party:
https://demo.luoyong.me/
Exception details:
Microsoft.IdentityServer.Web.InvalidRequestException: MSIS7042: The same client browser session has made '6' requests in the last '9' seconds. Contact your administrator for details.
at Microsoft.IdentityServer.Web.Protocols.PassiveProtocolHandler.UpdateLoopDetectionCookie(WrappedHttpListenerContext context)
at Microsoft.IdentityServer.Web.Protocols.PassiveProtocolHandler.ProcessCommonCookiesInLastAuthenticationStage(ProtocolContext context)
at Microsoft.IdentityServer.Web.Protocols.WSFederation.WSFederationProtocolHandler.SendSignInResponse(WSFederationContext context, MSISSignInResponse response)
at Microsoft.IdentityServer.Web.Protocols.WSFederation.WSFederationProtocolHandler.Process(ProtocolContext context)
at Microsoft.IdentityServer.Web.PassiveProtocolListener.ProcessProtocolRequest(ProtocolContext protocolContext, PassiveProtocolHandler protocolHandler)
at Microsoft.IdentityServer.Web.PassiveProtocolListener.OnGetContext(WrappedHttpListenerContext context)
打开部署管理器一看，原来我安装Dynamics 365 Customer Engagement 时候用的试用密钥，现在过期了。
换成正式的密钥，重启IIS和AD FS即告恢复正常。