Dear colleagues, After two days of tests I will ask you for help I try to connect Koha to Microsoft Active Directory 2019 and get this error: LDAP search failed to return object : 000004DC: LdapErr: DSID-0C090A5C, comment: In order to perform this operation a successful bind must be completed on the connection., data 0, v4563 at /usr/share/koha/lib/C4/Auth_with_ldap.pm line 96. What do I do wrong? Ldapsearch works perfect: ldapsearch -H ldap://hostname -x -D "CN=admin,OU=Admins,OU=OU_Users,DC=domain,DC=local" -w "Password" -b "CN=Users,DC=domain,DC=local" sAMAccountName=testuser Here is config from koha-conf.xml <ldapserver id="dc1"> <hostname>ldap:// hostname </hostname> <base>DC=domain,DC=local</base> <user>CN=admin,OU=Admins,OU=OU_Users,DC=dhim,DC=local</user> <pass>Password</pass> <auth_by_bind>1</auth_by_bind> <replicate>1</replicate> <update>0</update> <principal_name>CN=Users,DC=dhim,DC=local</principal_name> <mapping> <firstname is="givenname" ></firstname> <surname is="sn" ></surname> <userid is="samAccountName" ></userid> </mapping> </ldapserver>