LDAP on Server 2022

Question

I'm trying to connect to LDAP on Server 2022. I continue to receive the message.

"Failed to create a connection on port 389 or 636. Result Code from LDAP server 8 (strong auth required)"

I can connect to port 389 using the LDP Test Tool if SSL is unchecked. Once it's checked I cannot connect. I can never connect to port 636.

Answer 1

Hello there,

This issue might be the result of a non-default domain policy set in active directory that enforces all LDAP authentication to be secured with SSL.

This policy on the domain controller is: "Domain controller: LDAP server signing requirements" and if set to "Require signing" the LDAP data-signing option must be negotiated unless Transport Layer Security/Secure Socket Layer (TLS/SSL) is being used.

Change the policy Domain controller: LDAP server signing requirements on the Domain Controllers to None which will set the LDAP Data signing to not require in order to bind with the server and see if that helps.

Hope this resolves your Query !!

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Answer 2

ldp.exe is not connecting with port 636. Upon checking certificate is stored and LDAP signing is None through group policy. This issue only on Windows server 2022. Other OS is connecting fine.