When you try to establish a data-sharing session through Microsoft Office Communicator 2005, you may receive an error message (899568)


The information in this article 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 Buddy_name, either because Buddy_name 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 UPnPT 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.
Modification Type:MajorLast Reviewed:6/6/2005
Keywords:kbPlugPlay kbRTC kbNAT kbtshoot kbprb KB899568 kbAudEndUser kbAudITPRO
©2004 Microsoft Corporation. All rights reserved.