host server cannot be contacted. Check that connection has a valid host address. and that the whole server is powered on and working properly. Citrix virtual absence, desktop.

[Ram Thota]

Hi Citrix Support, 

I have updated Citrix virtual apps and desktop to 7 2407. I have successfully upgraded the citrix server, storefront and master images. While I am trying to update the machines on the machine catalogue, I'm getting the below error: “The host server (The XEN Hypervisor) cannot be contacted. Check that the connection has a valid host address and that the host server is powered on and working properly”. The Xen Hypervisor is working fine and accessible and pinging from Citrix Virtual Apps and Desktop Server. I have also cross-checked the Xen Hypervisor and CVAD Server's IP address and restarted the Citrix Host services. The Xen Hypervisor is running on version 7.1  What could be the issue? Please help me resolve this issue. The Error details from the log are as follows. 

 

Error Id: XDDS:E2E268F8

 

Exception:

    DesktopStudio_ErrorId : HypervisorNotContactable

    Reason : HostingInfrastructureCommunicationsFailureException

    Exception : PluginUtilities.Exceptions.HostingInfrastructureCommunicationsFailureException: Required property 'error' expects a non-null value. Path '', line 1, position 84. ---> PluginUtilities.Exceptions.WrappedPluginException: Required property 'error' expects a non-null value. Path '', line 1, position 84.

    

       --- End of inner exception stack trace ---

    

    Server stack trace: 

       at Citrix.PoolManagement.VMManager.VmmImplementation.XenEnterprise.DataAccess.TranslateAndThrowLogonProblem(Exception exception)

       at Citrix.PoolManagement.VMManager.VmmImplementation.XenEnterprise.XenServerSession.EnsureConnected(XenServerSessionType sessionType)

       at Citrix.PoolManagement.VMManager.VmmImplementation.XenEnterprise.XenServerSession.CallAndRetry[T](Func`2 xenServerCommandDelegate, XenServerSessionType sessionType, String caller)

       at Citrix.PoolManagement.VMManager.VmmImplementation.XenEnterprise.XenServerSession.VMGetAllRecords()

       at Citrix.PoolManagement.VMManager.VmmImplementation.XenEnterprise.XenServerSession.StartCacheThread()

       at Citrix.PoolManagement.VMManager.VmmImplementation.XenEnterprise.XenServerSession.InitializeConnection()

       at Citrix.PoolManagement.VMManager.VmmImplementation.XenEnterprise.XenFactory.CreateMachineManagerInternal(IConnectionDetails details, IFeatureService featureService)

       at Citrix.PoolManagement.VMManager.VmmImplementation.XenEnterprise.XenHypConnection..ctor(IConnectionDetails details, IFeatureService featureService)

       at Citrix.PoolManagement.VMManager.VmmImplementation.XenEnterprise.XenHypConnection.GetOrCreateConnection(IConnectionDetails details, IFeatureService featureService)

       at Citrix.PoolManagement.VMManager.VmmImplementation.XenEnterprise.XenHypervisor.<>c__DisplayClass39_0.<EnumerateContents>b__0()

       at HypervisorsCommon.CommonDistributedTracingClass.RunInActivity[T](Func`1 action, String hypervisorName, String methodName)

       at Castle.Proxies.Invocations.IHypervisor_EnumerateContents.InvokeMethodOnTarget()

       at Castle.DynamicProxy.AbstractInvocation.Proceed()

       at Citrix.PoolManagement.VMManager.VmmImplementation.XenEnterprise.XenServerInterceptor.Intercept(IInvocation invocation)

       at Castle.DynamicProxy.AbstractInvocation.Proceed()

       at Castle.Proxies.IXenHypervisorProxy.EnumerateContents(IConnectionDetails connectionDetails, String path, String rootPath, Boolean returnAll)

       at Citrix.HypervisorCommunicationsLibrary.AddInSideAdapter.IHypervisor_AddInViewToContractAdapter.EnumerateContents(IConnectionDetailsContract connectionDetails, String path, String rootPath, Boolean returnAll)

       at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)

       at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)

    

    Exception rethrown at [0]: 

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

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

       at Citrix.HypervisorCommunicationsLibrary.Contracts.IHypervisorContract.EnumerateContents(IConnectionDetailsContract connectionDetails, String path, String rootPath, Boolean returnAll)

       at Citrix.HypervisorCommunicationsLibrary.HostSideAdapter.IHypervisor_ContractToHostViewAdapter.EnumerateContents(IConnectionDetails connectionDetails, String path, String rootPath, Boolean returnAll)

       at RemoteHCLClient.Hypervisor.LoggedHypervisor.<>c__DisplayClass21_0.<EnumerateContents>b__0()

       at RemoteHCLClient.Hypervisor.LoggedHypervisor.EnumerateContents(IConnectionDetails connectionDetails, String path, String rootPath, Boolean returnAll)

       at Citrix.Host.Logic.HostLogic.GetHypervisorItemContents(HypervisorConnection connection, SecretStringBuffer password, String path, String rootPath, Boolean force, HypervisorObject[]& hypervisorObjects)

       at Citrix.Host.Logic.HostLogic.GetHypervisorItemContents(String path, String rootPath, HypervisorConnection connection, Char[] password, Boolean force, HypervisorObject[]& hypervisorObjects)

    Message : Required property 'error' expects a non-null value. Path '', line 1, position 84.

    Error Source : CitrixHostService

    Sdk Error Message : The hypervisor was not contactable at the supplied address. (Reason = Required property 'error' expects a non-null value. Path '', line 1, position 84.)

    Sdk Error ID : Citrix.XDPowerShell.HostStatus.HypervisorNotContactable,Microsoft.PowerShell.Commands.GetChildItemCommand

    ErrorCategory : ResourceUnavailable

    DesktopStudio_PowerShellHistory : GetGpuGroupsScript

    16-09-2024 16:40:29

    

    Set-HypAdminConnection  -AdminAddress "cvad2.fnmp.com:80" -BearerToken ********

    Get-ChildItem  -BearerToken ******** -LiteralPath @("XDHyp:\Connections\Xen Server")

    Get-ChildItem : The hypervisor was not contactable at the supplied address. (Reason = Required property 'error' expects a non-null value. Path '', line 1, position 84.)

    + CategoryInfo : InvalidOperation: (:) [Get-ChildItem], InvalidOperationException

    + FullyQualifiedErrorId : Citrix.XDPowerShell.HostStatus.HypervisorNotContactable,Microsoft.PowerShell.Commands.GetChildItemCommand

    Get-ChildItem : The hypervisor was not contactable at the supplied address. (Reason = Required property 'error' expects a non-null value. Path '', line 1, position 84.)

    + CategoryInfo : NotSpecified: (:) [Get-ChildItem], InvalidOperationException

    + FullyQualifiedErrorId : System.InvalidOperationException,Microsoft.PowerShell.Commands.GetChildItemCommand

    

    

    StackTrace: Citrix.Orchestration.Base.LogicModels.Exceptions.HypervisorNotContactableException The host server cannot be contacted. Check that the connection has a valid host address, and that the host server is powered on and working properly.

       at Citrix.Orchestration.Base.PowerShellInteraction.CmdletExecutionMethods.CreateException[T](ExecutionResults`1 results, ICmdletExecutionHost host)

       at Citrix.Orchestration.Base.PowerShellInteraction.CmdletExecutionMethods.Execute[T](ISdkCmdlet`1 sdkCmd, ICmdletExecutionHost host, Boolean allowFailover)

       at Citrix.Orchestration.Base.PowerShellSdk.HypervisorService.Scripts.GetGpuGroupsScript.RunScript()

       at Citrix.Orchestration.Base.PowerShellInteraction.PowerShellScript`1.Run()

       at Citrix.Console.Hypervisors.UI.Mmc.HostingUnitDetailsTabViewModel.RefreshGpuDetailsBackground(Object sender, EventArgs eventArgs)

       at Citrix.Console.CommonControls.ViewModelBase.<>c__DisplayClass90_0.<RunBackgroundTask>b__0(Object s, DoWorkEventArgs e)

    

Inner Exception:

    

    StackTrace: System.InvalidOperationException The hypervisor was not contactable at the supplied address. (Reason = Required property 'error' expects a non-null value. Path '', line 1, position 84.)

    

Thank you

With Regards

Ram Thota