No Server GUI – Avaya IP Office ACCS Ignition

We encountered a problem on the Ignition Wizard install of two Avaya IP Office ACCS Contact Centres, whereby after rebooting we could no longer see the Desktop after login, only receiving a black screen. Ctrl-Alt-Delete worked and we could run Task Manager OK, but not spawn Explorer. This happened to two separate 2012 R2 servers, at the same point in the installation process.

When you attempted to RDP to the servers and logon with the Domain admin account there are some errors raised in the Windows Application logs. In particular Event ID 18214

The machine-default access security descriptor for the COM Server application C:\Windows\System32\rdpclip.exe with APPID Unavailable is invalid. It contains Access Control Entries with permissions that are invalid. The requested action was therefore not performed. This security permission can be corrected using the Component Services administrative tool

This error message led me to start looking into DCOM permissions on the server. Below is where I found the modified permission, and the steps to fix it without explorer.exe:

  • CTRL+ALT+END to invoke Taskmanager
  • File > Run New Task
  • Browse to: C:\Windows\System32\dcomcnfg.exe & execute
  • Expand ‘Component Services’
  • Expand ‘Computers’
  • Right-Click ‘My Computer’ & select ‘Properties’
  • Select ‘COM Security’ tab
  • Under ‘Access Permissions’, select ‘Edit Default’
  • Change ‘SYSTEM’ object to remove ‘Remote Access’. Hit “OK”
  • From task manager, Start > Run > shutdown /r
  • Server reboots & GUI is restored


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WSUS Connection Error

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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Forums Online

Mucking around with some forum software, and have made a forum available at

You need to register to post, which will probably put most people off posting – The alternative is a forum full of Indonesian viagra spam, which the internet already has enough of.

You can post threads and request assistance with anything you come across here, or any other server issues which you would like to discuss.

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RDS Broken after Virtual Machine reconfiguration

After migrating a few virtual machines across datacentres (using vConverter in this instance, but the same error could occur with any type of VM configuration, specifically when adding and removing virtual NICs), I was no longer able to RDP a server previously configured with Remote Desktop Services (RDS). I actually forgot to screenshot the RDP error, but it was “Remote Desktop can’t connect to the remote computer for one of these reasons: 1) Remote accces to the server is not enabled 2) The remote computer is turned off 3) The remote computer is not available on the network.  Make sure the remote computer is turned on and connected to the network, and that remote access is enabled.”

On the affected host, navigate to RDS Administration (Start > Admin Tools > Remote Desktop Services > Remote Desktop Session Host Configuration:

Right-click the RDP-Tcp connection & select Properties:


The error message is displayed when switching to the Network Adapter tab:


“Remote Desktop Session Host Configuration tool is not able to obtain the properties for this connection. The connection has either been deleted or the internal state of this connection has been corrupted. Please close all property pages, and select refresh from the menu.”

You can see here the defined Network Adapter is missing completely, but can’t be changed:


Start Regedit and navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp

Set the ‘LanAdapter’ value to 0

Restart RDS services or server, and retry RDP!


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