This issue occurs in the following scenario:

  • You sign in to Microsoft Lync 2010 in an organization that has a proxy server deployed,¬†and the proxy server only supports basic authentication.

  • A Lync 2010 user in a non-federated organization sends you an invitation for an online meeting.

  • You try to join the meeting.

    Note To join the meeting, you must access the Internet through the proxy server.


To resolve this issue, install the following cumulative update:

2884632 Description of the cumulative update package for Lync 2010: October 2013


This issue occurs because Lync 2010 does not prompt the user to input credentials for the proxy server.


To work around this issue, you must use a proxy server that supports NTLM authentication.

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