Citrix Application Launch Fails with Web Interface using Internet Explorer

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Xavier Mustin

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#1
Symptoms

After upgrading to Internet Explorer 9, users are unable to launch applications once authenticated into Web Interface. Users are given a prompt to Open, Save, or Cancel the launch.ica connection file. Clicking Open to run the application is not successful.
If the option to save the file is selected, it is created with a temporary name with a ".partial" extension.


Cause
The issue occurs because Internet Explorer cannot access the cached ICA file. After upgrading a client device with Version 12.1 on the online plug-in installed to Windows Internet Explorer 9, attempts to launch applications from the Web Interface fail and a "Sharing Violation" error occurs.
Resolution
Install the latest Citrix Receiver version which can be downloaded from this location – Download Citrix Clients
This issue has been addressed with the latest available Plug-in.
A fix was first introduced with the 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
Workaround
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
  • 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

  • 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
  • Log off Web Interface and close then restart the browser after making this change.
 
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