Overview#

Event 2887 (DIRLOG_WOULD_REJECT_UNSIGNED_CLIENTS) is an Windows Security Log Event within the Microsoft Windows Logging system to assist in LDAPServerIntegrity

Event 2887 indicates:

• This Domain Controller is configured to accept binds using LDAPServerIntegrity but NOT currently configured to reject LDAPServerIntegrity for Bind Request
• The number of Bind Request this Domain Controller received from DUA within the past 24 hours without using LDAPServerIntegrity

Setting for the "LDAP Interface Events" event logging category to level 2 or higher allows viewing:

• Number of simple binds performed without SSL/TLS: "Value"
• Number of Negotiate/Kerberos/NTLM/Digest binds performed without signing: "Value"

More Information#

There might be more information for this subject on one of the following:

• LDAP Signing

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• [#1] - Event ID 2887 — LDAP signing - based on information obtained 2020-01-18
• [#2] - LDAP signing - based on information obtained 2020-01-18
• [#3] - Identifying Clear Text LDAP binds to your DC's - based on information obtained 2020-01-18
• [#4] - Query-InsecureLDAPBinds.ps1 - based on information obtained 2020-01-18