Koha version:	18.11.13.000
OS version ('uname -a'): Linux 3.16.0-6-amd64 #1 SMP Debian 3.16.57-2 (2018-07-14) x86_64

Hi,
I have success connecting KOHA with ACTIVE DIRECTORY for staff. However if I want to authenticate student, login is failed due to different domain suffix. This is my working ldap-activedirectory authentication. 

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<useldapserver>1</useldapserver>
  <ldapserver id="ldapserver" listenref="ldapserver">
  <hostname>ldap://ldaphostname:389</hostname>
  <base>OU=Staf,OU=Student,OU=User,OU=uuu,DC=dc,DC=local</base>
  <replicate>0</replicate>
  <update>0</update>
  <auth_by_bind>1</auth_by_bind>
  <anonymous_bind>0</anonymous_bind>
  <principal_name>%s@uuu.edu.my</principal_name>
  <update_password>0</update_password>
  <mapping>
      <userid       is="CN"        ></userid>
  </mapping>
  </ldapserver>

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This config is already working smoothly. But since STUDENT's email has different suffix domain such as %s@student.uuu.edu.my, hence the login is failed. 

Is there a way to combine multiple principal_name to make this work? I have read other bugs that said multiple ldapserver is not developed. In this case, it's not multiple ldapserver cause it has the same hostname and details. Only the domain in principal_name is different.

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The error I got when student is logged in is:
>> LDAP bind failed as kohauser MA19126: LDAP error #49: LDAP_INVALID_CREDENTIALS
>> The wrong password was supplied or the SASL credentials could not be processed