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Server Error in '/ecp' Application.

Active Directory server is not available. Error message: Active directory response: The LDAP server is unavailable.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ServiceModel.FaultException`1[[Microsoft.Exchange.Data.Directory.TopologyDiscovery.TopologyServiceFault, Microsoft.Exchange.Data.Directory, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Active Directory server is not available. Error message: Active directory response: The LDAP server is unavailable.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[FaultException`1: Active Directory server is not available. Error message: Active directory response: The LDAP server is unavailable.]

System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +14483202

System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +622

Microsoft.Exchange.Data.Directory.TopologyDiscovery.ITopologyClient.GetServersForRole(String partitionFqdn, List`1 currentlyUsedServers, ADServerRole role, Int32 serversRequested) +0

Microsoft.Exchange.Data.Directory.<>c__DisplayClass10.<InternalServiceProviderGetServersForRole>b__f(IPooledServiceProxy`1 proxy) +145

Microsoft.Exchange.Net.ServiceProxyPool`1.TryCallServiceWithRetry(Action`1 action, String debugMessage, WCFConnectionStateTuple proxyToUse, Int32 numberOfRetries, Boolean doNotReturnProxyOnSuccess, Exception& exception) +274

[ADTransientException: The call to Microsoft Exchange Active Directory Topology service on server 'TopologyClientTcpEndpoint (localhost)' returned an error. Error details Active Directory server is not available. Error message: Active directory response: The LDAP server is unavailable..]

Microsoft.Exchange.Data.Directory.ServiceTopologyProvider.GetConfigDCInfo(String partitionFqdn, Boolean throwOnFailure) +506

Microsoft.Exchange.Data.Directory.TopologyProvider.PopulateConfigNamingContexts(String partitionFqdn) +88

Microsoft.Exchange.Data.Directory.TopologyProvider.GetConfigurationNamingContext(String partitionFqdn) +86

Microsoft.Exchange.Data.Directory.ADSession.GetConfigurationNamingContext(String partitionFqdn) +243

Microsoft.Exchange.Data.Directory.ADDataSession.GetNamingContext(ADNamingContext adNamingContext) +601

Microsoft.Exchange.Data.Directory.ADDataSession.GetConnection(String preferredServer, Boolean isWriteOperation, String optionalBaseDN, ADObjectId& rootId, ADScope scope) +686

Microsoft.Exchange.Data.Directory.ADDataSession.GetReadConnection(String preferredServer, String optionalBaseDN, ADObjectId& rootId, ADRawEntry scopeDeteriminingObject, DualSearchMode dualSearchMode) +202

Microsoft.Exchange.Data.Directory.ADDataSession.InternalFind(ADObjectId rootId, String optionalBaseDN, ADObjectId readId, QueryScope scope, QueryFilter filter, SortBy sortBy, Int32 maxResults, IEnumerable`1 properties, Boolean includeDeletedObjects) +3632

Microsoft.Exchange.Data.Directory.SystemConfiguration.ADTopologyConfigurationSession.FindServerByFqdn(String serverFqdn) +184

Microsoft.Exchange.Data.Directory.SystemConfiguration.Server.GetLocalServerClientAccessArray() +129

Microsoft.Exchange.HttpProxy.PerfCounters.UpdateHttpProxyPerArrayCounters() +12

Microsoft.Exchange.HttpProxy.ProxyApplication.Application_Start(Object sender, EventArgs e) +366

[HttpException (0x80004005): The call to Microsoft Exchange Active Directory Topology service on server 'TopologyClientTcpEndpoint (localhost)' returned an error. Error details Active Directory server is not available. Error message: Active directory response: The LDAP server is unavailable..]

System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +12584905

System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +175

System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +304

System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +404

System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +475

[HttpException (0x80004005): The call to Microsoft Exchange Active Directory Topology service on server 'TopologyClientTcpEndpoint (localhost)' returned an error. Error details Active Directory server is not available. Error message: Active directory response: The LDAP server is unavailable..]

System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +12601936

System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +159

System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +12441597

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34009