How To: Test LDAPS Configuration

This article explains how to ensure an AD Domain controller has a working LDAPS configuration.

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Summary

This article has been created to help you check if LDAPS is working. Although from release 7.5.2, LDAP is supported, we still recommend that LDAPS is used for communication between Osirium PAM and your Active Directory.

Using LDAP will only allow read-only access between Osirium PAM and your Active Directory.  This means that you can not change the password of an Active Directory account or create a new account on the Active Directory through Osirium PAM.

This can only be done over LDAPS, hence why Osirium PAM recommends LDAPS to allow full management functionality when using Active Directory.

Applicable Version

7.x onwards.

Domain Controller Default

By default Domain Controller(s) listen over LDAP but not LDAPS.  They do however still have an active socket listening on the LDAPS port (TCP 636) but by default, this does not function correctly.

To function correctly the Domain Controller(s) require a certificate (with 'Server Authentication' enabled) to be installed.

This happens automatically for all Domain Controllers if there is a Microsoft Certificate Authority role installed somewhere in the domain and it is configured with an Enterprise Root certificate.

To enable LDAPS on a Domain Controller using a self-signed certificate and without installing the Microsoft Certificate Authority role in the Domain see here.

Testing LDAPS

It is not sufficient to only check if the Domain Controller is listening on the LDAPS port (TCP 636), you also need to confirm if LDAPS is working.

To verify if LDAPS has been configured on your Domain Controller and is functioning correctly, perform the following steps on each Domain Controller that Osirium PAM will need to communicate with:

1. RDP onto the Domain Controller

2. Open the Run dialogue box and run the ldp.exe application.

3. Within the Ldp window, click the Connection menu and select Connect...

4. Within the Connect window, fill in the details as shown below.

LDP connection screen

5. Click OK.

6. If the server is correctly configured for LDAPS then line 5 of the output (you might need to scroll up) will show that the host supports SSL.

screenshot showing the output for a correctly configured server

If the host is NOT configured for LDAPS then the following will be shown. This means Osirium PAM won't be able to communicate with that Domain Controller.

screenshot showing the output for an incorrectly configured server


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