WSUS Connection Error

Posted on November 8, 2016 by Nick






Went to administer WSUS today, and my MMC window prompted this:

Update Services: Error: Connection Error An error occurred trying to connect the WSUS server. This error can happen for a number of reasons. Check connectivity with the server. Please contact your network administrator if the problem persists. Click Reset Server Node to try to connect to the server again.

Strange. Started investigating and found the following

  • Server was up and connecting via RDP / RPC
  • IIS was up
  • Windows Internal Database & WSUS Service both up
  • Server connecting via telnet on port 8530
  • Local admin of the WSUS console via MMC failed with the same error message

Found errors in the event log:

clientwebThe WSUS administration console has encountered an unexpected error. This may be a transient error; try restarting the administration console. If this error persists, Try removing the persisted preferences for the console by deleting the wsus file under %appdata%\Microsoft\MMC\. System.NullReferenceException -- Object reference not set to an instance of an object. Source Microsoft.UpdateServices.UI.SnapIn Stack Trace: at Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.ResetScopeNode() Update Services failed its initialization and stopped.

Ran a “wsutil checkhealth”:

wsusutil checkhealth

Which led me to this error:

WebHost failed to process a request. Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/40282060 Exception: System.ServiceModel.ServiceActivationException: The service '/ClientWebService/client.asmx' cannot be activated due to an exception during compilation. The exception message is: This collection already contains an address with scheme http. There can be at most one address per scheme in this collection. If your service is being hosted in IIS you can fix the problem by setting 'system.serviceModel/serviceHostingEnvironment/multipleSiteBindingsEnabled' to true or specifying 'system.serviceModel/serviceHostingEnvironment/baseAddressPrefixFilters'. Parameter name: item. ---> System.ArgumentException: This collection already contains an address with scheme http. There can be at most one address per scheme in this collection. If your service is being hosted in IIS you can fix the problem by setting 'system.serviceModel/serviceHostingEnvironment/multipleSiteBindingsEnabled' to true or specifying 'system.serviceModel/serviceHostingEnvironment/baseAddressPrefixFilters'. Parameter name: item at System.ServiceModel.UriSchemeKeyedCollection.InsertItem(Int32 index, Uri item) at System.Collections.Generic.SynchronizedCollection`1.Add(T item) at System.ServiceModel.UriSchemeKeyedCollection..ctor(Uri[] addresses) at System.ServiceModel.ServiceHost..ctor(Type serviceType, Uri[] baseAddresses) at System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(Type serviceType, Uri[] baseAddresses) at System.ServiceModel.Activation.ServiceHostFactory.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: 2536

So I went off to C:\Program Files\Update Services\WebServices\ClientWebService\ to edit the web.config file. Had to take ownership of the file to enable me to make a change, and added the required flag at the appropriate level:

<serviceHostingEnvironment aspNetCompatibilityEnabled=”true”  multipleSiteBindingsEnabled=”true”/>

Restarted the server and everything started working again

 





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