Thread:Extension talk:LDAP Authentication/Enabled LiquidThreads (LQT) for this page. Please make all new support requests using LQT./reply/reply

Notice the debug log says:

Failed to start TLS.

I'm not totally sure why it went past this at all. The plugin should actually fail here. This is telling you that the plugin is failing to make an encrypted connection to the AD server.

Try setting the following:

$wgLDAPEncryptionType = array("AEP" => "ssl");

If that doesn't work, try:

$wgLDAPEncryptionType = array("AEP" => "clear");

If clear works, then you've at least narrowed the problem down to encryption. Fix your encryption problem if this is the case! Don't just leave this set as "clear", as this will send your user's passwords around the network in clear text (which is really bad). Check out the FAQ entry for encryption on windows.