You get the following error message in the LDAP event log:
Id : 1220 Message : LDAP over Secure Sockets Layer (SSL) will be unavailable at this time because the server was unable to obtain a certificate. Additional Data Error value: 8009030e No credentials are available in the security package
It is always a certificate problem.
However, there can be multiple reasons behind the same error message,
and all the following requirement have to be met.
- The LDAPS certificate is located in the
Local Computer‘s Personal certificate store (programmatically known as the
computer’s MY certificate store).
Follow this link to see different ways to import a certificate into the Local
- A private key that matches the certificate is present in the Local Computer’s store and is correctly associated
with the certificate.
- The private key strong protection has to be disabled.
KeyProtection = NCRYPT_UI_NO_PROTCTION_FLAG
- The Enhanced Key Usage extension includes the Server Authentication (188.8.131.52.184.108.40.206.1) object identifier (also
known as OID).
[EnhancedKeyUsageExtension] OID=220.127.116.11.18.104.22.168.1 ; Server Authentication
- The certificate was issued by a CA that the domain controller and
the LDAPS clients trust. Trust is
established by configuring the clients and the server to trust the root CA
to which the issuing CA chains.
- You must use the Schannel CSP to generate the key.
ProviderName = "Microsoft RSA SChannel Cryptographic Provider"
- The Active Directory fully qualified domain name of the domain controller (for example, DC01.DOMAIN.COM) must
appear in one of the following places:
- The CN in the Subject field.
- DNS entry in the Subject Alternative Name extension.
This last requirement was the problem in my case.
I falsely assumed that having the DNS entry in
the Subject field was sufficient.
In fact, it must be both in the subject and also in the SAN
field. Furthermore, it must be the first one in the list.