Home > Citrix > IE9 fails to launch Citrix Applications though 100% of launch.ica is downloaded

IE9 fails to launch Citrix Applications though 100% of launch.ica is downloaded

Issue: This has been an issue with the XenApp applications when launched from IE9 with any version of Citrix Online Plug-in older than 12.1.44 version.

Issue behavior: IE9 used to stuck up after 100% download of the file as it fails to launch the ica file. 

Workaround: A manual workaround is to trigger the fully downloaded ica file from the IE9 cache.

Fix: Citrix now released a newer version of Citrix Online Plug-in that is 12.1.44 in which this issue has been addressed.


From Citrix KB CTX129082: Application Launch Fails after Upgrading to Internet Explorer 9:


After upgrading to Internet Explorer 9, users are unable to launch applications once authenticated into Web Interface. They are given a prompt to open launch.ica but the application launch never completes.

If the option to save the file is selected, it is created with a temporary name with a ".partial" extension.


Citrix Technical Support is currently investigating the root cause of this issue; however, it appears to be caused by tightening of the file download behavior in Internet Explorer 9.


A fix is available with a special release of the following 12.1.44 version of the Citrix Online Plug-in.

CTX126653 – Citrix Online Plug-in 12.1.44 for Windows with Internet Explorer 9 Support


Configure Internet Explorer 9 as follows to allow successful application launching:

Caution! This fix requires you to edit the registry. Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it

  1. Disable ActiveX filtering feature for the Web Interface site, either by:
    Disabling ActiveX filtering globally:
    Click on Gear icon, select Safety, de-select ActiveX Filtering. Or alternative this can be reached in the same way by pressing Alt key followed by Tools menu (ActiveX filtering is enabled if a “tick” appears next to it and is disabled it the “tick” disappears next to it)

- Or -

Disabling ActiveX filtering for an individual site when ActiveX filtering is enabled globally:
Log on to the Web Interface site and attempt to launch an application, at the end of the address bar a blue warning sign will appear indicating filtered content:

    Click the blue warning sign and select Turn off ActiveX Filtering

  1. Enable ICA launch, either by:
    Add the site to the Trusted sites list: In the Security tab of Internet Options, add the Web Interface site to Trusted Sites list to allow the use of the ActiveX ICA client object for the launch
    - Or –
    Disable the MIME filter: by renaming the following registry key: HKEY_CLASSES_ROOT\PROTOCOLS\Filter\application/x-ica
  2. Log off Web Interface and close then restart the browser after making this change.

This document applies to:
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