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Manage Registrar configuration settings in Skype for Business Server 2015

 

Topic Last Modified: 2015-05-13

You can use the Registrar to configure proxy server authentication methods. The authentication protocol you specify determines which type of challenges the servers in the pool issue to clients. The available protocols are:

  • Kerberos   This is the strongest password-based authentication scheme available to clients, but it is normally available only to enterprise clients because it requires client connection to a Key Distribution Center (Kerberos domain controller). This setting is appropriate if the server authenticates only enterprise clients.

  • NTLM   This is the password-based authentication available to clients that use a challenge-response hashing scheme on the password. This is the only form of authentication available to clients without connectivity to a Key Distribution Center (Kerberos domain controller), such as remote users. If a server authenticates only remote users, you should choose NTLM.

  • Certificate authentication   This is the new authentication method when the server needs to obtain certificates from Lync Phone Edition clients, common area phones, Skype for Business and the Lync Windows Store app. On Lync Phone Edition clients, after a user signs in and is successfully authenticated by providing a personal identification number (PIN), Skype for Business Server 2015 then provisions the SIP URI to the phone and provisions a Skype for Business Server signed certificate or a user certificate that identifies Joe (Ex: SN=joe@contoso.com ) to the phone. This certificate is used for authenticating with the Registrar and Web Services.

noteNote:
We recommend that you enable both Kerberos and NTLM when a server supports authentication for both remote and enterprise clients. The Edge Server and internal servers communicate to ensure that only NTLM authentication is offered to remote clients. If only Kerberos is enabled on these servers, they cannot authenticate remote users. If enterprise users also authenticate against the server, Kerberos is used.
If you will use Lync Windows Store app clients, you must enable certificate authentication.

Follow these steps to create a new Registrar.

  1. From a user account that is a member of the RTCUniversalServerAdmins group (or has equivalent user rights), or assigned to the CsServerAdministrator or CsAdministrator role, log on to any computer that is in the network in which you deployed Skype for Business Server 2015.

  2. Open a browser window, and then enter the Admin URL to open the Skype for Business Server Control Panel. For details about the different methods you can use to start Skype for Business Server Control Panel, see Open Lync Server 2013 administrative tools.

  3. In the left navigation bar, click Security and then click Registrar.

  4. On the Registrar page, click New

  5. In Select a Service, click the service to which the Registrar is to be applied and then click OK.

  6. In New Registrar Setting, select one or more of the following depending on the capabilities of the clients and support in your environment:

    • Enable Kerberos authentication to have the servers in the pool issue challenges using Kerberos authentication.

    • Enable NTLM authentication to have the servers in the pool issue challenges using NTLM.

    • Enable certificate authentication to have the servers in the pool issue certificates to clients.

  7. Click Commit.

You can use the Registrar to configure proxy server authentication protocols. For information about the available protocols, see Manage Registrar configuration settings in Skype for Business Server 2015.

noteNote:
We recommend that you enable both Kerberos and NTLM when a server supports authentication for both remote and enterprise clients. The Edge Server and internal servers communicate to ensure that only NTLM authentication is offered to remote clients. If only Kerberos is enabled on these servers, they cannot authenticate remote users. If enterprise users also authenticate against the server, Kerberos is used.

Follow these steps to modify an existing Registrar.

  1. From a user account that is a member of the RTCUniversalServerAdmins group (or has equivalent user rights), or assigned to the CsServerAdministrator or CsAdministrator role, log on to any computer that is in the network in which you deployed Skype for Business Server 2015.

  2. Open a browser window, and then enter the Admin URL to open the Skype for Business Server Control Panel. For details about the different methods you can use to start Skype for Business Server Control Panel, see Open Lync Server 2013 administrative tools.

  3. In the left navigation bar, click Security and then click Registrar.

  4. On the Registrar page, click a service, click Edit, and then click Show details.

  5. In Edit Registrar Setting, select one or more of the following depending on the capabilities of the clients and support in your environment:

    • Enable Kerberos authentication to have the servers in the pool issue challenges using Kerberos authentication.

    • Enable NTLM authentication to have the servers in the pool issue challenges using NTLM.

    • Enable certificate authentication to have the servers in the pool issue certificates to clients.

  6. Click Commit.

  1. From a user account that is a member of the RTCUniversalServerAdmins group (or has equivalent user rights), or assigned to the CsServerAdministrator or CsAdministrator role, log on to any computer that is in the network in which you deployed Skype for Business Server 2015.

  2. Open a browser window, and then enter the Admin URL to open the Skype for Business Server Control Panel. For details about the different methods you can use to start Skype for Business Server Control Panel, see Open Lync Server 2013 administrative tools.

  3. In the left navigation bar, click Security and then click Registrar.

  4. On the Registrar page, and in the search field, type all or part of the name of the Registrar you want to delete.

  5. In the list, click the Registrar that you want, click Edit, and then click Delete.

  6. Click OK.

You can delete the Registrar configuration settings by using Windows PowerShell and the Remove-CsProxyConfiguration cmdlet. You can run this cmdlet from the Skype for Business Server Management Shell or from a remote session of Windows PowerShell. For details about using remote Windows PowerShell to connect to Skype for Business Server, see the blog article "Quick Start: Managing Microsoft Lync Server 2010 Using Remote PowerShell". The process is the same in Skype for Business Server.

  • The following command removes the Registrar security settings applied to the edge Server atl-edge-011.litwareinc.com:

    Remove-CsProxyConfiguration -Identity service:EdgeServer:atl-edge-011.litwareinc.com
    

  • The following command removes all the Registrar security settings applied to the Registrar service:

    Get-CsProxyConfiguration -Filter "service:Registrar:*" | Remove-CsProxyConfiguration
    

  • The following command deletes all the Registrar security settings that allow the use of NTLM for client authentication:

    Get-CsProxyConfiguration | Where-Object {$_.UseNtlmForClientToProxyAuth -eq $True}| Remove-CsProxyConfiguration
    

For details, see Remove-CsProxyConfiguration.

 
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