"Connection is not established" error message in a Lync 2010 client when an attendee is disconnected from an application-sharing session in a large conference

Article translations Article translations
Article ID: 2497779 - View products that this article applies to.
Expand all | Collapse all


Certain attendees are disconnected from an application-sharing session in a conference if the attendee amount becomes more than 200.Additionally, the disconnected attendees receive the following error message: 

Connection is not established.

Additionally, a retry button is displayed to rejoin the application-sharing session.


This issue occurs when too many messages are queued in a Remote Desktop Protocol (RDP) API thread. All new connect viewer calls in the Application Sharing Server (ASMCU) are rejected. Therefore, RDP loses certain protocol packets.


To resolve this issue, install the following cumulative update:
2496325 Description of the cumulative update package for Lync 2010: April 2011


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


Article ID: 2497779 - Last Review: April 6, 2011 - Revision: 1.0
  • Microsoft Lync 2010
kbqfe kbfix kbsurveynew kbexpertiseinter kbhotfixrollup KB2497779

Give Feedback


Contact us for more help

Contact us for more help
Connect with Answer Desk for expert help.
Get more support from smallbusiness.support.microsoft.com