Laut Storefront Server laut auf einem Citrix Delivery Controller für Xendesktop kein XML Dienst

Hallo,

es gibt in einer Xendesktop 7.6 Umgebung Problem mit Logins.
Delivery Controller gibt es 2 Stück

Laut Log auf Sf:
Event 4003
All the Citrix XML Services configured for farm Contoso_XD_76 failed to respond to this XML Service transaction.

Danach Event ID 28:

 Failed to launch the resource 'OBT_XD_76.XD_VM_Support_TEST $S1-1' using the Citrix XML Service at address 'http://Contoso.tester.local/scripts/wpnbr.dll'. All the Citrix XML Services configured for farm OBT_XD_76 failed to respond to this XML Service transaction.  
com.citrix.wing.SourceUnavailableException, PublicAPI, Version=2.6.0.0, Culture=neutral, PublicKeyToken=null
All the Citrix XML Services configured for farm OBT_XD_76 failed to respond to this XML Service transaction.
   at com.citrix.wing.core.mpssourceimpl.MPSFarmFacade.GetAddress(Context ctxt, String appName, String deviceId, String clientName, Boolean alternate, MPSAddressingType requestedAddressType, String friendlyName, String hostId, String hostIdType, String sessionId, NameValuePair cookies, ClientType clientType, String retryKey, LaunchOverride launchOverride)
   at com.citrix.wing.core.mpssourceimpl.MPSLaunchImpl.GetAddress(Context env, String appName, String deviceId, String clientName, Boolean alternate, MPSAddressingType requestedAddressType, String friendlyName, String hostId, String hostIdType, String sessionId, NameValuePair cookies, ClientType clientType, String retryKey, LaunchOverride launchOverride)
   at com.citrix.wing.core.mpssourceimpl.MPSLaunchImpl.LaunchRemoted(Dictionary`2 parameters, Context env, AppLaunchParams appLaunchParams)
   at com.citrix.wing.core.mpssourceimpl.MPSLaunchImpl.Launch(Dictionary`2 parameters, Context env, AppLaunchParams appLaunchParams)
   at com.citrix.wing.core.applyaccessprefs.AAPLaunch.Launch(Dictionary`2 parameters, Context env, AppLaunchParams appLaunchParams)
   at com.citrix.wing.core.clientproxyprovider.CPPLaunch.Launch(Dictionary`2 parameters, Context env, AppLaunchParams appLaunchParams)
   at com.citrix.wing.core.connectionroutingprovider.CRPLaunch.Launch(Dictionary`2 parameters, Context env, AppLaunchParams appLaunchParams)
   at com.citrix.wing.core.bandwidthcontrolprovider.BCPLaunch.Launch(Dictionary`2 parameters, Context env, AppLaunchParams appLaunchParams)
   at Citrix.DeliveryServices.ResourcesCommon.Wing.WingAdaptors.OverrideIcaFileLaunch.Launch(Dictionary`2 launchParams, Context env, AppLaunchParams appLaunchParams)
   at Citrix.DeliveryServices.ResourcesCommon.Wing.WingAdaptors.LaunchUtilities.IcaLaunch(IRequestWrapper request, Resource resource, LaunchSettings launchSettings, DateTime metricsStartTime, String retryKey)

com.citrix.wing.core.xmlclient.types.TransactionStatusException, Private, Version=2.6.0.0, Culture=neutral, PublicKeyToken=null
CharlotteErrorUnspecified
   at com.citrix.wing.core.xmlclient.transactions.ErrorResponsePacket.handleError(XmlServiceErrorInfo errorInfo)
   at com.citrix.wing.core.xmlclient.transactions.nfuse.AddressTransaction.ParseResponse(TResponseAddress addressResponse)
   at com.citrix.wing.core.xmlclient.transactions.ParsedTransaction.Transact()
   at com.citrix.wing.core.mpssourceimpl.MPSFarmFacade.GetAddress(Context ctxt, String appName, String deviceId, String clientName, Boolean alternate, MPSAddressingType requestedAddressType, String friendlyName, String hostId, String hostIdType, String sessionId, NameValuePair cookies, ClientType clientType, String retryKey, LaunchOverride launchOverride)