Topic Last Modified: 2010-10-27

Assigns a Kerberos account, which is used for Internet Information Services (IIS) authentication, to a site.


New-CsKerberosAccountAssignment -Identity <XdsIdentity> [-Confirm [<SwitchParameter>]] [-Force <SwitchParameter>] [-InMemory <SwitchParameter>] [-UserAccount <String>] [-WhatIf [<SwitchParameter>]]


Parameter Required Type Description




Unique identifier of the site where the Kerberos account is to be assigned. (This is the Identity of the site, not of the computer account.) For example: -Identity "site:Redmond".




Account name for the account to be assigned, using the format domain_name\user_name. For example: -UserAccount "litwareinc\kerberostest".

Note that, despite the name UserAccount, the account is actually a computer account, not a user account.



Switch Parameter

Suppresses the display of any non-fatal error message that might occur when running the command.



Switch Parameter

Creates an object reference without actually committing the object as a permanent change. If you assign the output of this cmdlet called with this parameter to a variable, you can make changes to the properties of the object reference and then commit those changes by calling this cmdlet’s matching Set- cmdlet.



Switch Parameter

Describes what would happen if you executed the command without actually executing the command.



Prompts you for confirmation before executing the command.

Detailed Description

In Microsoft Office Communications Server 2007 and Microsoft Office Communications Server 2007 R2, IIS ran under a standard user account. This had the potential to cause issues: if that password expired you could lose your Web Services, an issue that was often difficult to diagnose. To help avoid the issue of expiring passwords, Microsoft Lync Server 2010 enables you to create a computer account (for a computer that doesn’t actually exist) that can serve as the authentication principal for all the computers in a site that are running IIS. Because these accounts use the Kerberos authentication protocol, the accounts are referred to as Kerberos accounts, and the new authentication process is known as Kerberos web authentication. This enables you to manage all your IIS servers by using a single account.

To run your servers under this new authentication principal, you must first create a computer account by using the New-CsKerberosAccount cmdlet; this account is then assigned to one or more sites. After the assignment has been made, the association between the account and the Lync Server 2010 site is enabled by running the Enable-CsTopology cmdlet. Among other things, this creates the required service principal name (SPN) in Active Directory Domain Services (AD DS). SPNs provide a way for client applications to locate a particular service.

The New-CsKerberosAccountAssignment cmdlet enables you to assign a Kerberos account to a site that is currently not associated with an account. To change a site that is already associated with a Kerberos account, use the Set-CsKerberosAccountAssignment cmdlet instead.

Who can run this cmdlet: By default, members of the following groups are authorized to run the New-CsKerberosAccountAssignment 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 "New-CsKerberosAccountAssignment"}

Input Types

None. New-CsKerberosAccountAssignment does not accept pipelined input.

Return Types

New-CsKerberosAccountAssignment creates new instances of the Microsoft.Rtc.Management.WritableConfig.Settings.KerberosAccount.KerberosAccountAssignment object.


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

Copy Code
New-CsKerberosAccountAssignment -UserAccount "litwareinc\kerberostest" -Identity "site:Redmond"

The commands shown in Example 1 assign a Kerberos account (litwareinc\kerberostest) to the Redmond site, then call Enable-CsTopology in order to enable the assignment. To do this, the first command in the example uses New-CsKerberosAccountAssignment to associate the account "litwareinc\kerberostest" with the Redmond site. The second command then calls Enable-CsTopology in order to create the required SPN in AD DS and enable the new assignment.

See Also