An error occurred while updating the firmware 6721

There are currently three different types of authentication supported by Lync Server 2010: NTLM, Kerberos, and Certificate.

In the example above it is evident that multiple different Lync users have signed into Lync within the same Windows user profile.But both NTLM and Certificate authentication methods are enabled and used by default for both the Windows Lync client and the Lync Phone Edition client.Although NTLM authentication needs no introduction, this new-for-Lync certificate based method is still a mystery to many.Normally only one client certificate issued by ‘Communications Server’ would appear in a standard user’s store. As covered extensively in previous articles, PIN authentication is only available on the Aries family of Lync Phone Edition devices and this method of signing into a phone using only the user’s phone number (or extension) leverages only the TLS-DSK certificate method.Standard NTLM simply cannot be used here as there is no way for a user to key-in their full AD credentials in a format.

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