Microsoft KB Archive/899568

= When you try to establish a data-sharing session through Microsoft Office Communicator 2005, you may receive an error message =

Article ID: 899568

Article Last Modified on 5/21/2007

-

APPLIES TO


 * Microsoft Office Communicator 2005

-





SYMPTOMS
When you try to establish a data-sharing session through Microsoft Office Communicator 2005, you may receive the following error message:

Cannot establish the data sharing session with, either because   canceled the sessionor because you or the person you are calling is behind a firewall or Network Address Translator (NAT).



CAUSE
This issue may occur when the computer uses an UPnP™ certified Network Address Translation (NAT) device.

Typically, a single Session Initiation Protocol (SIP) port is required for data sharing through a NAT device. However, an UPnP certified NAT device requires two SIP ports to establish a data-sharing session. Communicator 2005 only uses a single SIP port for data sharing. It does not support data sharing through an UPnP certified NAT device.

Additional query words: Universal Plug and Play MOC MOC2005 Application

Keywords: kbplugplay kbrtc kbnat kbtshoot kbprb KB899568

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.