Does LDAP over SSL require a cert on the client?

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I am trying to resolve a problem whereby trying to set a users password over LDAP is failing because of an access denied error - even though I am authenticating against the AD with an admin user.

An answer found in stackoverflow says that either I have to run the IIS user as the admin user (which does work) or i should connect to LDAP via SSL. I cant go with the first option because I am using Elastic Beanstalk which will create and terminate instances so i cant change/set the user that IIS will be running as. So I am trying to use the LDAP over SSL idea. My question is does that still require that the client itself also have a certificate installed in order to establish trust with the Domain controller? Or does this work just by installing a cert on the Domain controller and allowing the connection over SSL? If it requires a certificate on the client then I have the same problem as i cant install anything on the client server other than the deployed app since Beanstalk is going to recereate and terminate that instance at will.

So does LDAPS require a cert on the client? Is there a better way to solve my problem given the infrastructure i am using?

So does LDAPS require a cert on the client?

no, LDAPS do not require client certificate. Domain controller certificate is sufficient to utilize LDAPS. More details about LDAPS and certificate requirement: LDAP over SSL (LDAPS) Certificate

trying to set a users password over LDAP is failing because of an access denied error

there might be over9000 reasons why you receive this message. You need to check whether you are successfully authenticated on DC, if yes, check whether you have permissions and privileges (especially, if UAC is enabled). I would set up audit policies (on failed user password changes) and check Security eventlog to figure out what is going wrong.

Does LDAP over SSL require a cert on the client?, Describes how to enable LDAP over SSL with a third-party certification authority. Requirements for an LDAPS certificate. To enable The certificate was issued by a CA that the domain controller and the LDAPS clients trust. Windows 2000 does not support the Start TLS extended-request functionality. Appendix A: Configuring LDAP over SSL Requirements for AD LDS - Windows Server 2008 and Windows Server 2008 R2 instructions Enabling LDAPS for Client Authentication Enabling LDAPS on the client is not necessary to protect credentials passed from the client to the server when LDAPS is already enabled on the server.


For openldap, I achieved this by adding this line to ldap.conf. But be aware of that, when you do that, your connections will be open to attacks like man-in-the-middle or any other.


How to enable LDAP over SSL with a third-party certification authority, Data ONTAP can use LDAP over SSL/TLS for setting up authenticated sessions have been issued by a certificate authority (CA) listed in the client's list of trusted CAs. Data ONTAP does not support signing (integrity protection) and sealing� There is no user interface for configuring LDAPS. Installing a valid certificate on a domain controller permits the LDAP service to listen for, and automatically accept, SSL connections for both LDAP and global catalog traffic. Requirements for an LDAPS certificate To enable LDAPS, you must install a certificate that meets the following requirements:

This is what I found using trial and error approach: Actually, LDAPS server always asks for client certificate. You can verify that by turning on SCHANNEL log and observing the following message:

If there is no client authentication certificate than LDAPS connection still succeeds, i.e. no client authentication certificate is required indeed. But if you have some invalid client authentication certificate (in my case it was an expired cert installed long ago by a third party app) the connection will fail w/o any error or warning in SCHANNEL log on the client side. It took me a while to figure this out.

LDAP over SSL (LDAPS) Certificate - TechNet Articles, Microsoft active directory servers will default to offer LDAP connections over Requires a working OpenSSL install (ideally Linux/OSX) and (obviously) a Windows client certificate; Accept and import certificate; Reload active directory SSL� LDAP over SSL/TLS (LDAPS-port 636) is automatically enabled when you install an Public key (PKI) infrastructure, (Certificate Authority-CA). In this post i wan’t cover installing and configuring PKI infrastructure, i’ll concentrate on enabling LDAPS on windows and configuring secure connection to Windows Domain controllers from linux machines using SSL certificates.

Yes of corse your client need a certificate to allow ladps communication betwen him and de server.

According to

As an option, you can use LDAPS for client authentication -- but doing so requires that you also install a client authentication certificate on each of your clients."

LDAP over SSL/TLS concepts, Also note that the terms “LDAP over SSL” and “LDAP over TLS” are used used to bind the LDAP client to the LDAP server are passed over the network unencrypted. Active Directory does not require, but supports, the use of an Using a single, common LDAPS certificate on all domain controllers� This allows the LDAP server to listen on one port (normally 389) for LDAP connections, and to switch to TLS as directed by the client. Active Directory does not use this option, and it should only be selected if required by your LDAP server. Require valid certificate from server Validates the certificate presented by the server during the TLS

Enable LDAP over SSL (LDAPS) for Microsoft Active Directory , Server uses its private key to decrypt the client generated session key. Establishing an SSL connection requires two certificates: one containing the public key of� LDAPS uses its own distinct network port to connect clients and servers. The default port for LDAP is port 389, but LDAPS uses port 636 and establishes SSL/TLS upon connecting with a client. Channel binding tokens help make LDAP authentication over SSL/TLS more secure against man-in-the-middle attacks.

Are you using LDAP over SSL/TLS? – Cloud OS, They are integrated with Active Directory using non-secure LDAP. Domain controller servers do have the latest patches installed. require the use of public key authentication via trusted end-entity SSL / TLS certificates. If events are found and you require more, identifying information such as the client IP� Port: enter the ldap ssl port; check the SSL box. Click OK to run the test. To connect to ADAM from a client over SSL, the client must trust the certificate on the computer running ADAM. This trust can be achieved by adding a certificate from the CA to the Trusted Root Certification Authorities store on the client. Use LDP from a client to make

Using LDAP Over SSL (LDAPS), LDAP over SSL/TLS (LDAPS-port 636) is automatically enabled and view the communications traveling between LDAP client and server computers. Domain controllers from linux machines using SSL certificates. Select No, do not export private key, for format select Base-64 require valid-user. Re: AD-LDAP access over SSL is not working A common mistake is to use IP address in the CUCM LDAP configuration while the LDAP certificate has the FQDN as CN (Common Name). Due to the security design of SSL, the requested URL has to match the certificate CN.

  • No. You can supply credentials of various forms: a client certificate is only one of those,
  • Ok thank you for clarifying. I am going to try and get the certificate working. I am using self signed and was having issues. And then will test it. I am pretty sure the error i am getting is because of the above because when i run IIS as a domain admin user then it works fine
  • by the way is it still true that you dont need a cert on client even when using a self signed cert on the domain controller?
  • If you have internal CA, I would like to suggest to use CA to issue LDAPS certificate. And yes, LDAPS do not use client certificates.
  • I installed the CA server on the domain controller which automatically installed the certificate and enabled LDAPS. Verified that was working using LDP. I then tried connecting to the AD from a different server and it failed. Only worked once I installed a certificate in the trusted publishers store of the client. So I am once again stuck . Is there some way to confgire the LDAPS that it doesnt need the client cert?
  • Appreciate the question and answer here. I was worried about having to setup auto-enrollment and such for client certs. The point is, only the DCs need to enroll for certs and trust the root CA and LDAPS is supported from then on as long as authentication succeeds.
  • As an option. It's not required. It's a poorly worded sentence. What he's trying to say is that you can configure AD to ask for a client certificate, which will be sufficient to authenticate the client without requiring further credentials.