Troubleshooting sharing issues in Lync Web App

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).

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.

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

• Close the browser window, and then rejoin the meeting.

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.

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”.

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.

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.

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.

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.

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.

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

• On your computer, close any other browser window that is part of the meeting or that shows the exit screen from the meeting, and then try sharing again.

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.

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

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.