Hi, I'm having such a hard time to get ldap with AD (on Windows Server 2012 R2) to work - now trying on 3.18.3 Koha login does see whether username/password is correct but exists with error on correct username/password. Yes, I changed <userid is="cn"></userid> and <principal_name>%s@kis.in</principal_name<mailto:%25s@kis.in%3c/principal_name>> to all the different variations I did find on the net. No success. Does anyone have any ideas? Rudy Wuthrich, Kodaikanal International School This is my ldap part from koha-config.xml <useldapserver>1</useldapserver><!-- see C4::Auth_with_ldap for extra configs you must add if you want to turn this on --> <ldapserver id="ldapserver" listenref="ldapserver"> <hostname>ldaps://serad1.kis.in</hostname> <base>OU=KISaaaa,OU=KISbbbb,DC=kis,DC=in</base> <user>CN=ldapuser,DC=kis,DC=in</user> <pass>password</pass> <replicate>1</replicate> <update>1</update> <auth_by_bind>1</auth_by_bind> <principal_name>%s@kis.in</principal_name<mailto:%25s@kis.in%3c/principal_name>> <mapping> <firstname is="givenname"></firstname> <surname is="sn"> </surname> <address is="">KIS</address> <userid is="cn"></userid> <password is=""></password> <email is="mail"></email> <phone is=""></phone> </mapping> Here is what happens: When I try with wrong username/password ? You entered an incorrect With correct username/password Software error: LDAP search failed to return object : 0000208D: NameErr: DSID-03100238, problem 2001 (NO_OBJECT), data 0, best match of: 'OU=KISStaff,DC=kis,DC=in' at /usr/share/koha/lib/C4/Auth_with_ldap.pm line 92. For help, please send mail to the webmaster ([no address given]<mailto:[no%20address%20given]>), giving this error message and the time and date of the error. And from the opac-error.log [Tue May 05 15:57:37 2015] [error] [client 172.16.98.24] [Tue May 5 15:57:37 2015] opac-user.pl: LDAP search failed to return object : 0000208D: NameErr: DSID-03100238, problem 2001 (NO_OBJECT), data 0, best match of:, referer: http://172.16.60.73:8000/cgi-bin/koha/opac-user.pl [Tue May 05 15:57:37 2015] [error] [client 172.16.98.24] [Tue May 5 15:57:37 2015] opac-user.pl: \t'OU=KISStaff,DC=kis,DC=in', referer: http://172.16.60.73:8000/cgi-bin/koha/opac-user.pl [Tue May 05 15:57:37 2015] [error] [client 172.16.98.24] [Tue May 5 15:57:37 2015] opac-user.pl: , referer: http://172.16.60.73:8000/cgi-bin/koha/opac-user.pl