Citrix Workspace Control not working on HP t5540

3 Dec

Yesterday I was troubleshooting why Workspace Control was not available on an HP t5540 (Windows CE) Thin Client. This was a Citrix Xenapp 5 environment on Server 2008. When logging in through the Web Interface from the Thin Client’s browser we noticed two things: Client Detection failed and the Reconnect and Disconnect buttons were not available: I looked into the files in the webinterface folder (wwwroot/Citrix/XenApp)and searched for workplace and reconnect. I determined that the Client Detection is done in the nativeClientDetect.js (app_data/clientDetection/clientscripts). But what I saw was very strange:

// Detect whether ICA Client is available.
<%
if ((sClientInfo.osWinCE() && sClientInfo.isIE())  || sClientInfo.osSymbian() ) {
%>
        // It is difficult to reliably detect processor type for WinCE and Symbian Devices
    // and therefore to choose the right flavour of the ICA client.
    // Also, it is not possible to simply download and install ICA client for some of these devices,
    // e.g. WBTs. Therefore, we assume that ICA client is always available.

    function detectNativeClient() {
        return true;
    }

// Detect whether ICA Client is available.

if ((sClientInfo.osWinCE() && sClientInfo.isIE()) || sClientInfo.osSymbian() ) {

// It is difficult to reliably detect processor type for WinCE and Symbian Devices

// and therefore to choose the right flavour of the ICA client.

// Also, it is not possible to simply download and install ICA client for some of these devices,

// e.g. WBTs. Therefore, we assume that ICA client is always available.

function detectNativeClient() {

return true;

}

This suggests that on Windows CE with Internet Explorer the Native Client Detection always returns true! This lead me to think that something was misconfigured on the Thin Client rather than in the Webinterface. I logged in as Administrator on the Thin Client and checked the Browser’s settings and found the Culprit there: by default the User Agent string is configured as “Same as Windows XP”:

I set the User Agent string to “Default (Windows CE)”:

Then I started the WebInterface again:

That’s much better!

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Filed under: Citrix

3 Responses for "Citrix Workspace Control not working on HP t5540"

Alastair Cunningham February 2nd, 2010 at 5:05 1
You’ve just saved me a world of pain troubleshooting this exact same issue on the t5540 clients. Thanks a bunch!
Roy Keating February 18th, 2010 at 17:31 2
Came across this one too. Has anyone else upgraded to web interface 5.2 with HP t5530 or t5540 terminals and found that when trying to launch published apps / desktops it throws up Internet Explorer errors? Sometimes it can take up to 10 attempts before it launches the app. Each time you have to click OK to the error and then click the app again.
Script to register ASP.NET in IIS | Remko Weijnen's Blog (Remko's Blog) November 26th, 2010 at 12:53 3
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