I'm working with the ADLDAP plugin in order to provide frontend authentication against my organizations Active Directory. The problem is that I continually receive the message "Can't bind to LDAP server!" after attempting to log in.

I tested the LDAP connection first on Windows Server 2016, by using the built in LDP.exe utility, and that test proved successful. Next, I constructed a pure PHP page, and the LDAP binding was successful.
Here is that code:


// using ldap bind
$ldaprdn  = '*****';     // ldap rdn or dn
$ldappass = '*****';  // associated password

// connect to ldap server
$ldapconn = ldap_connect("***.***.***.***")
    or die("Could not connect to LDAP server.");

if ($ldapconn) {

    // binding to ldap server
    $ldapbind = ldap_bind($ldapconn, $ldaprdn, $ldappass);

    // verify binding
    if ($ldapbind) {
        echo "LDAP bind successful...";
    } else {
        echo "LDAP bind failed...";



In Craft, I carefully followed the installation instructions, per the page: https://github.com/thepitagroup/adldap_craftcms as well as the changes introduced in the thread: https://github.com/thepitagroup/adldap_craftcms/issues/1. These changes were helpful and got me a little further along, but now, I'm stuck with the error message: "Can't bind to LDAP server!" The url remains on the 'login' page.

Is there a way to find more detail as to the cause of the error?

Thanks for any help.

1 Answer 1


In more testing, I was able to eliminate the "Can't bind to LDAP server!" error message from Craft by removing both: Account Suffix and Admin Account Suffix settings from the ADLDAP parameter control panel.
In my particular setup, I left all parameters empty in the 'optional' section of the parameter control panel, with the exception of the port ('389') and 'Follow Referrals.'

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