Hi,Thanks for your reply. Indeed php_ldap extension was comment in php.ini, I have uncomment it but it fails once again :PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20151012/php_ldap.dll' - /usr/lib/php/20151012/php_ldap.dll: cannot open shared object file: No such file or directory in Unknown on line 0 AH00163: Apache/2.4.25 (Debian) OpenSSL/1.0.2l configured -- resuming normal operations AH00094: Command line: '/usr/sbin/apache2' AH01071: Got error 'PHP message: PHP Warning: Declaration of AssignmentForm:($options) should be compatible with Form:($staff = true, $title = false, $options = Array) in /var/www/html/osticket/include/class.forms.php on line 4367\nPHP message: PHP Warning: Declaration of TransferForm:($options) should be compatible with Form:($staff = true, $title = false, $options = Array) in /var/www/html/osticket/include/class.forms.php on line 4487\n' AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Call to undefined function ldap_connect() in phar:///var/www/html/osticket/include/plugins/auth-ldap.phar/include/Net/LDAP2.php\nStack trace:\n#0 phar:///var/www/html/osticket/include/plugins/auth-ldap.phar/include/Net/LDAP2.php(339): Net_LDAP2->performConnect()\n#1 phar:///var/www/html/osticket/include/plugins/auth-ldap.phar/authentication.php(155): Net_LDAP2->bind()\n#2 phar:///var/www/html/osticket/include/plugins/auth-ldap.phar/authentication.php(188): LDAPAuthentication->getConnection()\n#3 phar:///var/www/html/osticket/include/plugins/auth-ldap.phar/authentication.php(427): LDAPAuthentication->authenticate('mjacquart', 'xxxx')\n#4 /var/www/html/osticket/include/class.auth.php(235): StaffLDAPAuthentication->authenticate('mjacquart', 'xxxx')\n#5 /var/www/html/osticket/scp/login.php(47): AuthenticationBackend:('mjacquart', 'xxxx', Array)\n#6 {main}\n thrown in phar:///var/www/html/osticket/include/plugins/auth-ldap.phar/include/Net/LDAP2.ph...\nPHP message: PHP Fatal error: Uncaught Error: Call to undefined function ldap_close() in phar:///var/www/html/osticket/include/plugins/auth-ldap.phar/include/Net/LDAP2.php\nStack trace:\n#0 /var/www/html/osticket/include/pear/PEAR.php(755): Net_LDAP2->_Net_LDAP2()\n#1 : _PEAR_call_destructors()\n#2 {main}\n thrown in phar:///var/www/html/osticket/include/plugins/auth-ldap.phar/include/Net/LDAP2.php on line 701\n', referer: http://192.168.10.60/html/osticket/scp/login.php