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I am integrating an iRedMail mail server with Active Directory (running on Windows 2012 R2) using this (official) guide, but when I try to perform a search in LDAP, I get an error message:

ldap_bind: Invalid DN syntax (34) additional info: invalid DN

I used this command:

ldapsearch -x -h win.basecamp.local -D 'vmail' -W -b 'cn=users,dc=basecamp,dc=local'

  • What version of CentOS? Please also provide the output of ldapsearch -VV. At worst, I would have expected ldap_bind: Invalid credentials (49) here. I can't immediately reproduce that error with only ldapsearch - at least not with the versions I readily have available. – ziesemer Oct 29 '16 at 21:00
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The value passed to -D option is invalid. Man page has this explanation for -D option:

-D binddn
    Use the Distinguished Name binddn to bind to the LDAP directory.

You apparently used a username (vmail) while you should have used a distinguished name (similar to what you have in -b option) for password authentication.

I suspect (but CANNOT be sure) that distinguished name for your vmail user might be:

'cn=vmail,cn=users,dc=basecamp,dc=local'
-1

When I replaced the server domain name with its IP address, it have worked like a charm. So something went wrong with my DNS configuration.

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