Schtasks /Query ERROR: The system cannot find the path specified


When running a schtasks /query command, for example:

schtasks /Query /TN ScheduledDefrag

the following error appears:

ERROR: The system cannot find the path specified.


Even though the name of the task is, in this instance, ScheduledDefrag, the command is looking for the entire path

schtasks /Query /TN \Microsoft\Windows\Defrag\ScheduledDefrag


The path can be found by concatenating the “Location” and “Name (both under the general tab when the task is selected)

Citrix XenApp could not contact the server. Please check your network connection.


When opening a published application, the following error shows:

Citrix XenApp could not contact the server. Please check your network connections.


In Internet Explorer, ensure Use a proxy server for your LAN and Bypass proxy server for local addresses are ticked.  Click on Advanced.  Under the Exceptions / Do not use proxy server for addresses beginning with, add the domain or local subnet, and click OK

You cannot install the 64-bit version of Microsoft Access Database Engine 2010 because you currently have 32-bit Office products installed


You cannot install the 64-bit version of Microsoft Access Database Engine 2010 because you currently have 32-bit Office products installed.


Microsoft doesn’t allow side-by-side installation of Microsoft Office 32-bit and 64-bit.


  1. Install from the command line using the passive switch
    AccessDatabaseEngine_x64.exe /passive
  2. Open the registry (regedit.exe)
  3. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\14.0\Common\FilesPaths
  4. Delete mso.dll


If you don’t delete the mso.dll registry entry, Office will come up with Reconfiguring when opened.

System.Net.WebException: The request failed with HTTP status 503: Service Unavailable


Even though the Automatic Deployment Tool we use for downloading a deploying SCEP definitions was reporting as successfully, we noticed that servers did not have the latest antivirus definition installed.  When manually running a update in the SCEP client, it failed with the following:

Virus and spyware definitions update failed
Error code: 0x80244022
Error description: System Center Endpoint Protection couldn't install the definition updates. Please try again later.


WARNING: There was an error communicating with the endpoint at 'HTTP://XXXXXX.DOMAIN.COM:8530/SimpleAuthWebService/SimpleAuth.asmx'.
WARNING: The server returned HTTP status code '503 (0x1F7)' with text 'Service Unavailable'.
WARNING: The service is temporarily overloaded.
WARNING: Web service call failed with hr = 80244022.


System.Net.WebException: The request failed with HTTP status 503: Service Unavailable.~~ at Microsoft.UpdateServices.Administration.AdminProxy.CreateUpdateServer(Object[] args)~~ at Microsoft.SystemsManagementServer.WSUS.WSUSServer.ConnectToWSUSServer(String ServerName, Boolean UseSSL, Int32 PortNumber)
Remote configuration failed on WSUS Server.


  1. Open the IIS Manager console on the SCCM Primary server
  2. Under Connections, expand the server, and click on Application Pools
  3. You will see that the WsusPool application pool has stopped.
  4. Right-click WsusPool, and click on Advanced Settings…
  5. Scroll down to Recycling, set the value for Private Memory Limit (KB) to 4000000,and click OK
  6. Back at the Application Pool window, ensure WsusPool is still selected, and in the Actions pane, click Start

BSOD – The bugcheck was: 0x000000f4


The computer has rebooted from a bugcheck. The bugcheck was: 0x000000f4 (0x0000000000000003, 0xfffffa80bd3e09a0, 0xfffffa80bd3e0c80, 0xfffff80001dd3b60).


Two XenApp 6.5 servers blue screened and rebooted one morning last week with the following:

FAULTING_MODULE: 000000004a560000 csrss
PROCESS_OBJECT: fffffa80be232060
IMAGE_NAME: csrss.exe

Luckily this happened only 4 weeks before, and after raising a job with Citrix they noted they could see that csrss.exe had an exception, however we only had Kernel Memory Dump enabled, so support could not find any information in the user space.  I enabled Complete Memory Dumps on the XenApp 6.5 desktop platform then.

Refer to the following article on how to change the dump level:

We reopened the archived case, compressed, and uploaded the complete memory dump.

We received the response:

       From the dump we can see that Client/Server Runtime Subsystem process (csrss.exe) was terminated.
  • We do not see any of the Citrix modules involved in the thread call stack.
  • There was an exception while running sxs!BufferedStream::getLineBuf+0x1f
  • Microsoft’s SXS.DLL time stamp was Sat Nov 20 18:44:52 2010

We raised and logged a case with Microsoft.

What they came back with was:

Exception reported when handling sxs!BufferedStream::getLineBuf
_xxxxxpos variable is not allowed to be subtracted. This is how the exception happened.
 0x034 _lMarkedlinepos  : 0n-2025 <<<<<<<<< This value is negative

The solution from Microsoft was to install the following hotfix:

Surprisingly, the issue is caused by click-once applications, in our case – Yammer.Notifier.exe