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Event ID 1220 — LDAP over SSL

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Applies To: Windows SBS 2003, Windows SBS 2008, Windows Server 2000, Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2, Windows Server 2008, Windows Server 2008 Foundation, Windows Server 2008 R2, Windows Server 2008 R2 Foundation, Windows Server 2008 R2 with SP1, Windows Server 7

Lightweight Directory Access Protocol (LDAP) communications between client computers and server computers can be encrypted with LDAP over Secure Sockets Layer (SSL) connections. You can configure Active Directory Domain Services (AD DS) and Active Directory Lightweight Directory Services (AD LDS) to support LDAP over SSL.

Important

More detailed and recently updated information regarding this warning and how to resolve it have been published to the following TechNet Wiki articles:

Event Details

Product

Windows Operating System

ID

1220

Source

Windows Server® 2003 and Windows Server® 2003 R2: Active Directory

Windows Server® 2008 and Windows Server® 2008 R2: Microsoft-Windows-ActiveDirectory_DomainService

Version

5.0 and 6.0

Symbolic Name

DIRLOG_LDAP_SSL_NO_CERT

Message

LDAP over Secure Sockets Layer (SSL) will be unavailable at this time because the server was unable to obtain a certificate.

Resolve

Event ID 1220 is logged on a domain controller when client computers attempt to make an LDAP-over-SSL connection to the directory when SSL connections are not enabled on the directory. If you want to configure a domain controller or an AD LDS server to support SSL connections, you must provide a certificate for the AD DS or AD LDS directory to use. If you do not want to support LDAP over SSL connections on the directory, identify the client computers that are attempting to make such connections so that you can resolve this issue.

Membership in Domain Admins, or equivalent, is the minimum required to complete this procedure. Perform the following procedure on a domain controller or a computer that has RSAT installed. See Installing Remote Server Administration Tools for AD DS (https://go.microsoft.com/fwlink/?LinkId=144909).

If you want to configure your domain controllers to support SSL connections, you can install and configure the Active Directory Certificate Services (AD CS) role on a domain controller or you can import a certificate from a trusted certification authority (CA).

Warning

In most cases, you should not install a CA on a domain controller. For additional information, see PKI Design Brief Overview (https://social.technet.microsoft.com/wiki/contents/articles/pki-design-brief-overview.aspx).

If you want to configure your domain controllers to support SSL connections, you can install and configure the Active Directory Certificate Services (AD CS) role on a domain controller or you can import a certificate from a trusted certification authority (CA). If you install the AD CS role and specify the Setup Type as Enterprise on a domain controller, all domain controllers in the forest will be configured automatically to accept LDAP over SSL. For instructions about installing and configuring a local certificate server using a Windows Server 2008 computer, see the Active Directory Certificate Services Step-by-Step Guide (https://go.microsoft.com/?linkid=9645085).

In most cases you should use a certificate from a CA that is not installed on a domain controller. The certificate that you import into the LDAP server [e.g. domain controller or Active Directory Application Mode, or Active Directory Lightweight Directory Services (AD LDS)] must meet the following specifications:

  1. Certificate must be valid for the purpose of Server Authentication. This means that it must also contains the Server Authentication object identifier (OID): 1.3.6.1.5.5.7.3.1

  2. The Subject name or the first name in the Subject Alternative Name (SAN) must match the Fully Qualified Domain Name (FQDN) of the host machine, such as Subject:CN=server1.contoso.com. For more information, see How to add a Subject Alternative Name to a secure LDAP certificate (https://support.microsoft.com/kb/931351).

  3. The host machine account must have access to the private key.

If you are preparing a Windows Server 2008 or Windows Server 2008 R2 domain controller to accept LDAP over SSL (LDAPS) connections you should import the certificate into the AD DS personal store (as shown in the following procedure). If you are working on a Windows Server 2003 or Windows Server 2003 R2 computer, you should import the certificate into as described in Configure Authentication and Encryption (https://technet.microsoft.com/en-us/library/cc757003.aspx). If you are working on an AD LDS server, then you should following the instructions in Appendix A: Configuring LDAP over SSL Requirements for AD LDS. ((https://go.microsoft.com/?linkid=9645086)

To import a certificate into the AD DS personal store

  1. Open a command prompt as an administrator. To open a command prompt as an administrator, click Start. In Start Search, type Command Prompt. At the top of the Start menu, right-click Command Prompt, and then click Run as administrator. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Yes.

  2. To open Microsoft Management Console (MMC), type mmc, and then press ENTER.

  3. Click File, click Add/Remove Snap-in, select Certificates from the available snap-ins, and then click Add.

  4. In Add or Remove Snap-ins, click Service account to view the certificates that are stored in the service's personal store, and then click Next.

  5. In Add or Remove Snap-ins, click Local computer, and then click Next.

  6. In Add or Remove Snap-ins, click Active Directory Domain Services, click Finish, and then click OK.

  7. In the console tree, expand Certificates - Service (Active Directory Domain Services), expand Personal, and then expand Certificates.

  8. To import a certificate, right-click the NTDS\Personal folder, click All Tasks, and then click Import. When the certificate is imported, client computers should be able to make SSL connections to all domain controllers in the forest.

Note

If you are working on a Windows Server 2003 or Windows Server 2003 R2 computer, you should import the certificate into as described in Configure Authentication and Encryption (https://technet.microsoft.com/en-us/library/cc757003.aspx). If you are working on an AD LDS server, then you should following the instructions in Appendix A: Configuring LDAP over SSL Requirements for AD LDS. (https://go.microsoft.com/?linkid=9645086)

Note

The community version of this topic is on the TechNet Wiki as Event ID 1220 — LDAP over SSL (LDAPS) (https://social.technet.microsoft.com/wiki/contents/articles/2979.aspx)

Verify

Membership in Domain Users, or equivalent, is the minimum required to complete this procedure. Learn more about default group memberships online (https://go.microsoft.com/fwlink/?LinkID=150761). Perform the following procedure on a domain controller or a computer that has Remote Server Administration Tools (RSAT) installed. For more information about RSAT, see Installing Remote Server Administration Tools for AD DS (https://go.microsoft.com/fwlink/?LinkId=144909).

To confirm that LDAP over SSL is configured successfully

  1. Open the Ldp snap-in. To open Ldp, click Start. In Start Search, type ldp. Right-click the Ldp icon on the Start menu, and then click Run as administrator. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Yes.

  2. Click the Ldp Connection menu, and then click Connect. In Server, type the host name of the server to which you want to connect. Ensure that Port is set to 636, the Connectionless check box is cleared, and the SSL check box is selected, and then click OK. If you receive a message that says “Cannot open connection,” LDAP-over-SSL binding is not configured properly.

  3. Click the Connection menu, click Bind, and then click OK.

  4. The command output should display the user name and domain name that you used for binding, if LDAP over SSL is configured properly.

Tip

To install LDP on computers running Windows Server® 2003 or Windows® XP operating systems, install Windows Server 2003 Support Tools from the Windows Server 2003 product CD or from the Microsoft Download Center (https://go.microsoft.com/fwlink/?LinkId=100114). For more information about how to install Windows Support Tools from the product CD, see Install Windows Support Tools (https://go.microsoft.com/fwlink/?LinkId=62270).

See Also

Other Resources

Request a computer certificate for server authentication
Article 321051 in the Microsoft Knowledge Base
Certificates How To
Certificate Services
To post technical questions visit the Directory Services forum