Parameters

Client certificates provide an alternate way for users to be authenticated by Lync Server 2010. Instead of providing a user name and password, users present the system with an X.509 certificate. (This certificate must have a subject name or subject alternative name that identifies the user.) To be authenticated, users only need to type in a personal identification number (PIN); it’s typically easier for mobile phone users to type in a PIN than to type in an alphanumeric user name and/or password.

The Get-CsClientCertificate cmdlet provides a way for administrators to retrieve information about the Lync Server client certificates that have been issued to their users. This information includes both the date and time that the certificate was issued in addition to the date and time when the certificate will expire.

Note that, by default, the firewall exceptions for SQL Server Express are not enabled when you install the Standard Edition of Lync Server 2010. That means that you will not be able to run Get-CsClientCertificate from a remote instance of Windows PowerShell; that’s because your command will not be able to traverse the firewall and access the SQL Server Express database. (However, you can still run the cmdlet locally on the Standard Edition server itself.) If you need to run Get-CsClientCertificate remotely against a Standard Edition server you must manually enable the firewall exceptions for SQL Server Express.

Who can run this cmdlet: By default, members of the following groups are authorized to run the Get-CsClientCertificate cmdlet locally: RTCUniversalServerAdmins. To return a list of all the role-based access control (RBAC) roles this cmdlet has been assigned to (including any custom RBAC roles you have created yourself), run the following command from the Windows PowerShell prompt:

Get-CsAdminRole | Where-Object {$_.Cmdlets –match "Get-CsClientCertificate"}

String value or Microsoft.Rtc.Management.ADConnect.Schema.ADUser object. Get-CsClientCertificate accepts pipelined input of string values representing the Identity of a user account. The cmdlet also accepts pipelined input of user objects.

Get-CsClientCertificate returns instances of the Microsoft.Rtc.Management.UserPinService.CertInfoDetails object.

-------------------------- Example 1 ------------------------

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Get-CsClientCertificate -Identity "Ken Myer"

The command shown in Example 1 returns all the client certificates issued to Ken Myer.

-------------------------- Example 2 ------------------------

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Get-CsClientCertificate -Identity "Ken Myer" | Where-Object {$_.ExpirationTime -lt "9/1/2011"}

Example 2 returns all the client certificates issued to Ken Myer that are set to expire before September 1, 2011. To do this, the command first uses Get-CsClientCertificate to return a collection of all the client certificates issued to Ken Myer. This collection is then piped to the Where-Object cmdlet, which picks out only those certificates where the ExpirationTime property is less than less than September 1, 2011 (9/1/2011). The date specified in this example (9/1/2011) uses the U.S. English format for date-time values. Dates should be specified using a format compatible with your Regional and Language Options.

-------------------------- Example 3 ------------------------

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Get-CsClientCertificate -Identity "Ken Myer" | Where-Object {$_.PublicationTime -gt "1/1/2010"}

The preceding command returns all the client certificates that have been issued to Ken Myer since January 1, 2010. To accomplish this task, the command first calls Get-CsClientCertificate to return a collection of all the client certificates issued to Ken Myer. This collection is then piped to Where-Object, which selects only those certificates where the PublicationTime property is greater than January 1, 2010 (1/1/2010).

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Get-CsUser | Where-Object {$_.RegistrarPool -ne $Null} | Get-CsClientCertificate

The command shown in Example 4 returns client certificates for all the users who have been enabled for Lync Server and who have been assigned to a Registrar pool. (An error will be returned if you try to retrieve certificate information for a user who has not been assigned to a Registrar pool). To do this, the command first calls Get-CsUser without any parameters. This collection is then piped to the Where-Object cmdlet, which selects only those users where the RegistrarPool property is not equal to a null value. This filtered collection is then piped to Get-CsClientCertificate, which returns the certificates assigned to each user in the collection.

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