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The security of a Windows 2008 (r2) Active Directory server can be significantly improved by configuring the server to accept only signed or SSL/TLS LDAP binds.

The security of a Windows 2008 (r2) Active Directory server is default configured to be backwards compatible with Windows 2000 / NT and XP. Now that these operating systems are replaced (they are not supported by Microsoft for months or even years now) the security can be significantly improved by configuring the server to reject Simple Authentication and Security Layer (SASL) LDAP binds that do not request signing (integrity verification) or to reject LDAP simple binds that are performed on a clear text (non-SSL/TLS-encrypted) connection. SASLs may include protocols such as the Negotiate, Kerberos, NTLM, and Digest protocols. This document has information about:
  • How to discover clients that do not use the "Require signing" option
  • How to configure the directory to require LDAP server signing
  • The FixIt tool (50518)

How to verify current Authentication level:

  • Click Start, click Run, type ldp.exe, and then click OK.
  • Under the Connection menu, click Connect.
  • In the Server field and in the Port field, type the server name and the non-SSL/TLS port of your directory server, and then click OK.
    Note For an Active Directory Domain Controller, the applicable port is 389.
  • After a connection is established, select Bind on the Connection menu.
  • Under Bind type, select Simple bind.
  • Type the user name and password, and then click OK.
    if you receive the following error message, you successfully secured your directory server:
    Ldap_simple_bind_s() failed: Strong Authentication Required

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