I did the change and this is how my /etc/ldap/ldap.conf looks now
TLS_REQCERT never
This is the change I did in the /var/lib/mediawiki/LocalSettings.php
$wgLDAPEncryptionType = array( "EUROPE.LAN" => "clear" );
And this the debug file. Still no success...
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering validDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 User is using a valid domain (EUROPE.LAN).
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Setting domain as: EUROPE.LAN
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getCanonicalName
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Username is: Mediawiki
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Munged username: Mediawiki
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getCanonicalName
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Username is an IP, not munging.
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getCanonicalName
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Username is an IP, not munging.
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering userExists
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering authenticate for username Mediawiki
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering Connect
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Using TLS or not using encryption.
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Using servers: ldap://DC1.EUROPE.LAN:389
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 PHP's LDAP connect method returned true (note, this does not imply it connected to the server).
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getSearchString
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Doing a straight bind
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 userdn is: EUROPE.LAN\mediawiki
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Binding as the user
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Failed to bind as EUROPE.LAN\mediawiki
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering allowPasswordChange
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering modifyUITemplate
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain
2015-09-16 07:29:34 MONITOR1 mediawiki: 2.1.0 Entering getDomain