Hi team,
Recently I had been asked to apply some GPOs to both Domain Controllers in order to improve security. I applied them and after restarting both Domain Controllers the LDAP protocol stopped working as we expected.
LDAP works if a Microsoft servers sends the query, but if we try to use LDAP from Linux it doesn't works.
Running Wireshark on one of the DC I've got the following messages:
![]()
LdapErr is the following:
LDAPMessage searchResDone(182) operationsError (000004DC: LdapErr: DSID-0C0907C2, comment: In order to perform this operation a successful bind must be completed on the connection., data 0, v2580) [0 results]
messageID: 182
protocolOp: searchResDone (5)
[Response To: 7]
[Time: 0.000252000 seconds]
Already rollback the following GPOs for DC, and this is how they are now:
Network security: LDAP client signing requirements
-
None
Domain controller: LDAP server signing requirements
-
None
Domain member: Digitally encrypt secure channel data (when possible) -
Enabled
Domain member: Digitally sign secure channel data (when possible) -
Enabled
What else can be causing this LDAP behaviour?
Thanks in advance,
Will