Google OpenId：找不到 OpenID 端点（间歇性）

通常使用 Google OpenId 工作正常，每天数千次，然后它会开始间歇性出错并超时一个小时左右（某些请求会验证，但不是全部）。反复验证最终会起作用。

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

添加 log4net 会产生：

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

And

DotNetOpenAuth.Http WebException: 
 Timeout from https://www.google.com/accounts/o8/id, no response available.

有任何想法吗？

听起来您需要修复网络延迟。谷歌似乎不太可能成为这里的瓶颈。

您可能还希望增加 HTTP 超时以降低失败率。提供全套选项here。具体来说，您可能正在寻找：

<untrustedWebRequest
            timeout="00:00:10"
            readWriteTimeout="00:00:01.500" />

查看配置链接以查看其所在位置的上下文。