TTUHSC Information Technology
HomeInformation TechnologyInformation ServicesIT Solution CenterUnified Communications

Lync 2010 Help and Training

Troubleshooting sharing issues in Lync Web App

This article provides help about desktop and program sharing issues with Microsoft Lync Web App communications software.

In this article

Supported platforms


Is my operating system supported?

The ability to share your desktop or programs with Lync Web App is supported for all versions of Windows that are listed in Supported Platforms for Lync Web App, except for Windows Server 2000.

You cannot share your desktop or programs if you are running a Macintosh operating system or if your browser and operating system combination are not listed as a supported platform (for example, Google Chrome running on Windows).

back to top

Troubleshooting by platform


The following sections provide troubleshooting tips for users of the specified platforms.

Windows Server 2008 R2, Windows Server 2008, or Windows Server 2003 operating systems

Why can’t I install the Lync Web App plug-in on my computer running a Windows Server operating system?

Try disabling the Do not save encrypted pages to disk option:

  1. In Windows Internet Explorer, click Tools and then click Internet Options.
  2. On the Advanced tab, check whether the Do not save encrypted pages to disk option is enabled (it is enabled by default on server computers).
  3. Disable this option to successfully download and run the Lync Web App plug-in installer.

If this doesn’t work, you may also need to change the default security settings. For instructions on how to change these settings, see DisableMSI (Windows) at http://msdn.microsoft.com/en-us/library/aa368304(VS.85).aspx.

back to top
Windows 7 operating system with Internet Explorer 8

After I update the Lync Web App plug-in, the meeting window stops responding.

This is a known issue in cases where an older version of the Lync Web App plug-in is uninstalled during a meeting.

back to top
Windows 7, Windows Vista, Windows Server 2008 R2, or Windows Server 2008 operating systems

I have more than one monitor. Why don’t I have the option to share a monitor?

To share a monitor, the DPI on your computer must be set to 100% or lower. (The DPI, from “dots per inch”, is a measure of pixel density.) To view and change the DPI setting, go to your computer’s display settings. In Windows 7 and Windows Vista, display settings are in Control Panel, in the Appearance and Personalization section.

back to top
Windows Server 2008 operating system with Internet Explorer 8

I receive a “Javascript not enabled” message when I try to install the Lync Web App plug-in. What should I do?

  1. In Internet Explorer, click Tools and then click Internet Options.
  2. On the Security tab, click Trusted sites, and then click the Sites button.
  3. Under Add this website to the zone, enter the meeting URL details (for example, “https://*.contoso.com”), and then click Add.

Note: Make sure that you add both the “http” and “https” URLs to the Trusted sites, for example, “https://*.contoso.com” and “http://*.contoso.com”.

back to top
Windows Server 2008 operating system or Windows Vista operating system with Service Pack 2 or earlier

When I try to install the Lync Web App plug-in, the process fails and I receive a “UAC” error.

Make sure that User Account Control (UAC) is turned on, and then try installing the plug-in again. For instructions, see Turn User Account Control on or off at http://windows.microsoft.com/en-US/windows-vista/Turn-User-Account-Control-on-or-off.

back to top
Internet Explorer

After I install the Lync Web App plug-in, I receive the following Program Compatibility Assistant message: “This program might not have installed correctly.” What should I do?

You may see this dialog box if someone else has already installed the plug-in on the computer that you’re using. In this case, click This program installed correctly, and continue working.

back to top
Windows Server 2000 operating system, Macintosh operating systems, or Google Chrome

Why can’t I share my desktop or a program?

Desktop and program sharing is not supported on Windows Server 2000 or Macintosh operating systems or with the Google Chrome Internet browser. To participate in sharing sessions, join the meeting using a supported platform. For more information, see Supported Platforms for Lync Web App.

back to top
Any browser and operating system

I am unable to install the Lync Web App plug-in. What should I do?

Make sure that your computer is running a supported operating system version. For a list of supported operating systems, see Supported Platforms for Lync Web App.

When I click Install plug-in or Update plug-in, I receive a “Pop-up blocked” notification. How should I respond?

  1. Exit the meeting.
  2. Ensure that the meeting invitation is from a trusted source.
  3. Rejoin the meeting.
    The “Pop-up blocked” notification will re-appear.
  1. Select Always allow pop-ups from this site.

Important: Do not select Temporarily allow pop-ups.

I cannot share my desktop or program. How should I troubleshoot this?

Make sure that your browser is not in “Run as Administrator” mode, restart the browser, and then try sharing again.

When I try to share my desktop or program, I receive the following message: “Cannot start sharing in two simultaneous meetings”.

I receive the following error message while installing the Lync Web App plug-in: “The process terminated unexpectedly.” What should I do?

This may occur because another installation is already in progress on your computer. Click OK in the message, wait for the first installation to finish, and then proceed with your sharing activity. You will have to restart the plug-in installation.

Alternatively, this may occur if you chose not to restart the browser during installation. Restart the browser, and try installing the plug-in again.

After I start sharing my screen, I receive the following Windows operating system Security Alert: “Windows Firewall has blocked some features of this program.” What should I do?

Screen sharing does not require this permission, so you can ignore this alert. Select any response, close the alert, and continue sharing.

Why does my desktop and program sharing always fail?

If your computer is configured to use HTTP proxy server, which requires an authentication, you will not be able to share your desktop or programs. Contact the meeting organizer for other collaboration options.

back to top
©