Article ID: 2796753 - View products that this article applies to.
This article describes an update that enables Microsoft Lync 2010 users to join a meeting when proxy authentication is required.
Consider the following scenario:
Cannot sign in because the server is temporarily unavailable.
error ID 28 (source ID 238).
Note After this update is installed you will be prompted to type in credentials when you try to join a meeting.
To enable users to join meetings when proxy authentication is required, apply the following update:
(http://support.microsoft.com/kb/2791382/ )Description of the cumulative update package for Lync 2010: March 2013