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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.
But for an Aries device this is the only way to get the AD credentials into the phone.
This USB-based approach to authentication offers two distinct advantages over the PIN Authentication method: .
Only NTLM authentication can be used by any Lync clients to directly connect to the Exchange Client Access Server to access the account’s mailbox.
By default Kerberos is not completely functional throughout Lync Server as some additional configuration steps must be completed first.
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.
Max Validity Period Hours can be any integer value between 8 hours and 8760 hours (365 days). When using certificate authentication, clients can request the period of time (in hours) that the certificate remains valid.
Min Validity Period Hours represents the minimum amount of time a client can request.
Alternatively the touch-screen equipped Tanjay devices (e.g.