How to enable LDAP signing in Windows computers

To make sure that the attacker doesn’t use a forged LDAP client to change server configuration and data, it is essential to enabling LDAP signing.  It is equally important to enable it on the client machines. The last section helps you to figure out clients that do not have Require signing enabled on the computer. It is a useful tool for IT admins to isolate those computers, and enable the security settings on the computers.

1] Set the server LDAP signing requirement

2] Set the client LDAP signing requirement by using local computer policy

3] Set the client LDAP signing requirement by using a domain Group Policy Object

4] Set the client LDAP signing requirement by using registry keys

The first and foremost thing to do is take a backup of your registry

Open Registry EditorNavigate to HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ \ParametersRight-click on the right pane, and create a new DWORD with name LDAPServerIntegrityLeave it to its default value.

: Name of the AD LDS instance that you want to change.

5] How to verify if configuration changes now require sign-in

To make sure the security policy is working here is how to check its integrity. If you receive an error message saying  Ldap_simple_bind_s() failed: Strong Authentication Required, then you have successfully configured your directory server.

6] How to find clients that do not use the “Require signing” option

Every time a client machine connects to the server using an insecure connection protocol, it generates Event ID 2889.  The log entry will also contain the IP addresses of the clients. You will need to enable this by setting the 16 LDAP Interface Events diagnostic setting to 2 (Basic). Learn how to configure AD and LDS diagnostic event logging here at Microsoft. LDAP Signing is crucial, and I hope the was able to help you clearly understand how you can enable LDAP signing in Windows Server, and on the client machines.