Can't sign in to Lync 2013 by using a cached certificate in Lync online hybrid deployment

Applies to: Microsoft Lync 2013

Symptoms


You can't sign in to Lync 2013 when the cached certificate is expired.

Cause


This issue occurs because Microsoft Lync 2013 uses the cached online certificate for the on-premises AutoDiscover service when Lync 2013 signs in, which fails. Then, Lync 2013 tries to achieve a new certificate from an on-premises service. The achievement fails too. Therefore, Lync 2013 sign-in fails. 

Workaround


To work around this issue, click Delete my sign-in infor in the sign-in window of Lync 2013 to remove the record of your logon ID and password from your computer’s memory.

Resolution


To resolve this issue, install the following update:
2881070 August 2014 update for Lync 2013 (KB2881070)