SharePoint 2013 CA 爬网一直爬，却爬不到任何东西

爬网不止，爬了一宿什么都没有爬到；

爬网日志报错，报了两个错误；

去15/logs里面找日志；
Non-OAuth request. IsAuthenticated=True, UserIdentityName=0#.w|domain\user, ClaimsCount=125 b5b2d49c-feb7-e08b-ecf7-28204da68508

UserAgent not available, file operations may not be optimized. at Microsoft.SharePoint.SPFileStreamManager.CreateCobaltStreamContainer(SPFileStreamStore spfs, ILockBytes ilb, Boolean copyOnFirstWrite, Boolean disposeIlb) at Microsoft.SharePoint.SPFileStreamManager.SetInputLockBytes(SPFileInfo& fileInfo, SqlSession session, PrefetchResult prefetchResult) at Microsoft.SharePoint.CoordinatedStreamBuffer.SPCoordinatedStreamBufferFactory.CreateFromDocumentRowset(Guid databaseId, SqlSession session, SPFileStreamManager spfstm, Object[] metadataRow, SPRowset contentRowset, SPDocumentBindRequest& dbreq, SPDocumentBindResults& dbres) at Microsoft.SharePoint.SPSqlClient.GetDocumentContentRow(Int32 rowOrd, Object ospFileStmMgr, SPDocumentBindRequest& dbreq, SPDocumentBindResults& dbres...

The crawler could not communicate with the server. Check that the server is available and that the firewall access is configured correctly.

事件查看器报错；
WebHost failed to process a request.
Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/63363381
Exception: System.ServiceModel.ServiceActivationException: The service '/90ac4adbb96a4e89892b2ad7ab02da51/MetadataWebService.svc' cannot be activated due to an exception during compilation. The exception message is: The farm is unavailable.. ---> System.InvalidOperationException: The farm is unavailable.
at Microsoft.SharePoint.Administration.Claims.SPSecurityTokenServiceManager.get_Local()
at Microsoft.SharePoint.IdentityModel.SPServiceIssuerNameRegistry..ctor()
at Microsoft.SharePoint.SPServiceHostOperations.Configure(ServiceHostBase serviceHost, SPServiceAuthenticationMode authenticationMode)
at Microsoft.SharePoint.Taxonomy.MetadataWebServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses)
at System.ServiceModel.ServiceHostingEnvironment.HostingManager.CreateService(String normalizedVirtualPath, EventTraceActivity eventTraceActivity)
at System.ServiceModel.ServiceHostingEnvironment.HostingManager.ActivateService(ServiceActivationInfo serviceActivationInfo, EventTraceActivity eventTraceActivity)
at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath, EventTraceActivity eventTraceActivity)
--- End of inner exception stack trace ---
at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath, EventTraceActivity eventTraceActivity)
at System.ServiceModel.ServiceHostingEnvironment.EnsureServiceAvailableFast(String relativeVirtualPath, EventTraceActivity eventTraceActivity)
Process Name: w3wp
Process ID: 6004


试过重启搜索服务，重启服务器，修改搜索账号为服务器场管理员；所有内容源爬网都不行了；
环境搭建了半年有余，一直没运行过搜索服务，搜索服务由配置向导创建；现在初次运行，就不能爬网了；