Symptoms
This issue occurs in the following scenario:
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You sign in to Microsoft Lync 2010 in an organization that has a proxy server deployed, and the proxy server only supports basic authentication.
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A Lync 2010 user in a non-federated organization sends you an invitation for an online meeting.
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You try to join the meeting. Note To join the meeting, you must access the Internet through the proxy server.
Resolution
To resolve this issue, install the following cumulative update:
2884632 Description of the cumulative update package for Lync 2010: October 2013
Cause
This issue occurs because Lync 2010 does not prompt the user to input credentials for the proxy server.
Workaround
To work around this issue, you must use a proxy server that supports NTLM authentication.
