Symptoms
When this issue occurs, the following events are logged in Application logĀ for Microsoft Lync Server 2010:
Note FIPS means Federal Information Processing Standard.
Resolution
To resolve this issue, install one of the following updates:
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Hotfix rollup 3013370 for the .NET Framework 3.5.1 on Windows 7 SP1 and Windows Server 2008 R2 SP1
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Hotfix rollup 3013372 for the .NET Framework 3.5 on Windows 8 and Windows Server 2012
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Hotfix rollup 3013375 for the .NET Framework 3.5 on Windows 8.1 and Windows Server 2012 R2
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Hotfix rollup 3013376 for the .NET Framework 2.0 SP2 on Windows Server 2003 SP2
More Information
This issue occurs because Microsoft .NET Framework uses non-FIPS compliant implementation of Secure Hash Algorithm 1 (SHA1), such as the SHA1Managed Class.