Repeat the following steps in each domain controller to install the LDAPS TLS certificate in the NTDS\Personal certificate store.

To install the LDAPS TLS certificate in a Domain Controller 

1. Copy in the Domain Controller machine the P12 file obtained when Generating the LDAPS TLS certificates.
2. If not already installed, install the Certificate Templates snap-in as explained in Enabling the Certificate Templates snap-in.
3. In the management console, right-click NTDS\Personal under Certificates.
   
   
   
4. Select All Tasks > Import to display the Certificate Import Wizard.
5. Follow the wizard instructions to import the certificate file, enter the password, and install the certificate in the NTDS\Personal certificate store.