错误消息是：

Event code: 200000 
Event message: No OpenID endpoint found. : https://www.google.com/accounts/o8/id 

Sequence contains no elements@H_301_5@ 
 
添加log4net产量：
 
  
 
DotNetOpenAuth.Yadis:
Error while performing discovery on: "https://www.google.com/accounts/o8/id": 
DotNetOpenAuth.Messaging.ProtocolException:
 Error occurred while sending a direct message or getting the response. 
 ---> System.Net.WebException: The operation has timed out     
  at System.Net.HttpWebRequest.GetResponse()    
  at DotNetOpenAuth.Messaging.StandardWebRequestHandler.GetResponse
     (HttpWebRequest request,DirectWebRequestOptions options) 
     in  c:\...\Dot...Core\Messaging\StandardWebRequestHandler.cs:line 127    
 --- End of inner exception stack trace ---     
  at DotNetOpenAuth.Messaging.StandardWebRequestHandler.GetResponse
     (HttpWebRequest request,DirectWebRequestOptions options) 
     in c:\...\Dot...Core\Messaging\StandardWebRequestHandler.cs:line 175
  at DotNetOpenAuth.Messaging.UntrustedWebRequestHandler.GetResponse
     (HttpWebRequest request,DirectWebRequestOptions options)
     in c:\...\Dot...Core\Messaging\UntrustedWebRequestHandler.cs:line 250
  at DotNetOpenAuth.Yadis.Yadis.Request
     (IDirectWebRequestHandler requestHandler,Uri uri,Boolean requireSsl,String[] acceptTypes) 
     in c:\...\Dot...OpenId\Yadis\Yadis.cs:line 172
  at DotNetOpenAuth.Yadis.Yadis.Discover
     (IDirectWebRequestHandler requestHandler,UriIdentifier uri,Boolean requireSsl)
     in c:\...\DotNetOpenAuth.OpenId\Yadis\Yadis.cs:line 63
  at DotNetOpenAuth.OpenId.UriDiscoveryService.Discover
     (Identifier identifier,IDirectWebRequestHandler requestHandler,Boolean& abortDiscoveryChain) 
     in c:\...\DotNet...OpenId\OpenId\UriDiscoveryService.cs:line 51
  at DotNetOpenAuth.OpenId.IdentifierDiscoveryServices.Discover
     (Identifier identifier) 
     in c:\...\Dot...OpenId\OpenId\IdentifierDiscoveryServices.cs:line 58
  at DotNetOpenAuth.OpenId.RelyingParty.AuthenticationRequest.Create
     (Identifier userSuppliedIdentifier,OpenIdRelyingParty relyingParty,Realm realm,Uri returnToUrl,Boolean createNewAssociationsAsNeeded) 
     in ...OpenId.RelyingParty\OpenId\RelyingParty\AuthenticationRequest.cs:line 364@H_301_5@ 
 
和
 
  
 
DotNetOpenAuth.Http WebException: 
 Timeout from https://www.google.com/accounts/o8/id,no response available.@H_301_5@ 
 
有任何想法吗？