I am using Mediawiki 1.12 on a Linux Debian system. I have installed the LDAP_Authentication extension for medaiwiki version 1.12 [1]. The good news is that I am able to connect and log into mediawiki using our company's Active Directory server authentication with the following settings in LocalSettings.php: $wgLDAPEncryptionType = array( "mycompany.net" => "clear" ); However the bad news is that if I try to use the TLS encryption method like this:  $wgLDAPEncryptionType = array( "mycompany.net" => "tls" ); I get the following debug messages: ************************************************************************************** Entering validDomain User is using a valid domain. Setting domain as: mycompany.net Entering getCanonicalName Username isn't empty. Munged username: JohnS Entering authenticate Entering Connect Using TLS or not using encryption. Using servers:  ldap://ad1.mycompany.net Using TLS< Warning:ldap_start_tls() [function.ldap-start-tls]: Unable to start TLS: Decoding error in /var/lib/mediawiki/extensions/LdapAuthentication/LdapAuthentication.php on line 197 Failed to start TLS.Failed to connect Entering strict. Returning true in strict(). Entering modifyUITemplate ************************************************************************************** with medaiwiki login page saying "Login error: Incorrect password entered. Please try again." How can I check if my Active Directory server uses TLS method? Is the problem with the Active Directory or in my setup of the LDAP_Authentication extension? Thanks