Exchange Web-services stopped working. Unable to access the /ews/exchange.asmx URL.

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  Launching the https://autodiscover.XXXXX.com/ews/exchange.asmx throws "Server Error in '/EWS' Application." 
  
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  Invalid URI: The hostname could not be parsed.
  
  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.UriFormatException: Invalid URI: The hostname could not be parsed.
  
  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: 
  
  
  [UriFormatException: Invalid URI: The hostname could not be parsed.]
     System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) +8603457
     Microsoft.Exchange.Net.WSTrust.TokenValidator..ctor(Uri targetUri, IEnumerable`1 trustedTokenIssuerCertificates, IEnumerable`1 tokenDecryptionCertificates) +163
     Microsoft.Exchange.Data.Storage.Authentication.ExternalAuthentication.CreateExternalAuthentication() +1160
     Microsoft.Exchange.Data.Storage.Authentication.ExternalAuthentication.GetCurrent() +25
     Microsoft.Exchange.Services.Wcf.EWSServiceCredentialsElement.CreateBehavior() +455
     System.ServiceModel.Description.ConfigLoader.LoadBehaviors(ServiceModelExtensionCollectionElement`1 behaviorElement, KeyedByTypeCollection`1 behaviors, Boolean commonBehaviors) +239
     System.ServiceModel.Description.ConfigLoader.LoadServiceDescription(ServiceHostBase host, ServiceDescription description, ServiceElement serviceElement, Action`1 addBaseAddress, Boolean skipHost) +1691
     System.ServiceModel.ServiceHostBase.LoadConfigurationSectionInternal(ConfigLoader configLoader, ServiceDescription description, ServiceElement serviceSection) +106
     System.ServiceModel.ServiceHostBase.ApplyConfiguration() +234
     System.ServiceModel.ServiceHostBase.InitializeDescription(UriSchemeKeyedCollection baseAddresses) +206
     System.ServiceModel.ServiceHost..ctor(Type serviceType, Uri[] baseAddresses) +170
     Microsoft.Exchange.Services.Wcf.EWSServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) +55
     System.ServiceModel.HostingManager.CreateService(String normalizedVirtualPath, EventTraceActivity eventTraceActivity) +1849
     System.ServiceModel.HostingManager.ActivateService(ServiceActivationInfo serviceActivationInfo, EventTraceActivity eventTraceActivity) +66
     System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath, EventTraceActivity eventTraceActivity) +738
  
  [ServiceActivationException: The service '/EWS/exchange.asmx' cannot be activated due to an exception during compilation.  The exception message is: Invalid URI: The hostname could not be parsed..]
     System.Runtime.AsyncResult.End(IAsyncResult result) +594083
     System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result) +238
     System.Web.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar) +178
  
  
  Can anyone help me resolve this issue.

  Thursday, September 14, 2017 10:14 AM