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Why does Citrix Desktop Toolbar in Windows 7 client keep crashing with connection to Server 2012R2 XenDesktop 7.15 VDA?


Andrew Will

Question

We are running Published Desktops in XenDesktop 7.15 on Server 2012R2 VDA. The clients are running on Windows 7 using Citrix Workspace 1903 connecting to the published desktop. With XenDesktop 7.15 you have the Citrix Desktop Toolbar which users can use to toggle between their Citrix Desktop Session and their local workstation. I've seen several instances where a user tries to toggle back to their workstation using the Citrix Toolbar Home button, when they click the toolbar a .net framework error appears with a general error "object reference not set to an instance of an object." You have an option to continue or quit, if you choose to quit the Citrix Desktop session will close and you will need to log in again.

 

I currently manage several XenDesktop 7.15 Farms and I have seen this behavior on several Windows 7 clients in different farms. This issue also occurred when we were using Citrix Receiver 4.9 LTSR.

 

Most of the workstations are running .net framework 4.7.2.

 

Has anyone else seen this behavior? I've been searching the forum but I haven't found a similar scenario described. Right now we use SolarWinds Take Control / MSP Anywhere to remotely view our client workstations. I'm wondering if shadowing a user session with SolarWinds Take Control is causing the issue, but I've heard reports of this occurring on stations I hadn't logged into for a couple days.

 

Any help is much appreciated. Thank you.

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Update - In case this helps someone else. I determined that it was our SolarWinds remote assistance tool that was causing the XenDesktop Toolbar to crash. If a Windows 7 User had their XenDesktop session open in full screen when remote assistance connected the toolbar would crash. Using the XenDesktop toolbar to switch the session to window mode before connecting to client workstation would avoid the xendesktop toolbar crash.

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I'm still struggling with this one. Here is the .net framework exception text:

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
   at Citrix.DesktopViewer.CommonToolbarTag.Grip_MouseMove(Object sender, MouseEventArgs e)
   at System.Windows.Forms.Control.OnMouseMove(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseMove(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3324.0 built by: NET472REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
CDViewer
    Assembly Version: 19.3.0.4
    Win32 Version: 19.3.0.4
    CodeBase: file:///C:/Program%20Files%20(x86)/Citrix/ICA%20Client/CDViewer.exe
----------------------------------------
DesktopViewer
    Assembly Version: 19.3.0.4
    Win32 Version: 19.3.0.4
    CodeBase: file:///C:/Program%20Files%20(x86)/Citrix/ICA%20Client/DesktopViewer.DLL
----------------------------------------
Citrix.Diagnostics
    Assembly Version: 7.1.3.0
    Win32 Version: 7.1.3.0
    CodeBase: file:///C:/Program%20Files%20(x86)/Citrix/ICA%20Client/Citrix.Diagnostics.DLL
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
   Win32 Version: 4.7.3324.0 built by: NET472REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3353.0 built by: NET472REL1LAST_B
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3221.0 built by: NET472REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Configuration.Install
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3062.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration.Install/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.Install.dll
----------------------------------------
Citrix.Diagnostics.Recorder.Cdf
    Assembly Version: 7.1.3.0
    Win32 Version: 7.1.3.0
    CodeBase: file:///C:/Program%20Files%20(x86)/Citrix/ICA%20Client/Citrix.Diagnostics.Recorder.Cdf.DLL
----------------------------------------
System.Runtime.Remoting
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3221.0 built by: NET472REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Runtime.Remoting/v4.0_4.0.0.0__b77a5c561934e089/System.Runtime.Remoting.dll
----------------------------------------
System.Configuration
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3324.0 built by: NET472REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Core
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3324.0 built by: NET472REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Xml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3221.0 built by: NET472REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
RedirectionManager
    Assembly Version: 19.3.0.4
    Win32 Version: 19.3.0.4
    CodeBase: file:///C:/Program%20Files%20(x86)/Citrix/ICA%20Client/RedirectionManager.DLL
----------------------------------------
System.Web
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3282.0 built by: NET472REL1LAST_B
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_32/System.Web/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Web.dll
----------------------------------------
AxWFICALib
    Assembly Version: 2.11.0.0
    Win32 Version: 2.11.0.0
    CodeBase: file:///C:/Program%20Files%20(x86)/Citrix/ICA%20Client/AxWFICALib.DLL
----------------------------------------
WFICALib
    Assembly Version: 2.11.0.0
    Win32 Version: 2.11.0.0
    CodeBase: file:///C:/Program%20Files%20(x86)/Citrix/ICA%20Client/WFICALib.DLL
----------------------------------------
Accessibility
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3062.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Accessibility/v4.0_4.0.0.0__b03f5f7f11d50a3a/Accessibility.dll
----------------------------------------
PrefUI
    Assembly Version: 19.3.0.4
    Win32 Version: 19.3.0.4
    CodeBase: file:///C:/Program%20Files%20(x86)/Citrix/ICA%20Client/PrefUI.DLL
 

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