tente isso. no seu lugar de configuração do apache:
<Location /rt>
AddDefaultCharset UTF-8
SetHandler perl-script
PerlResponseHandler RT::Mason
Require valid-user
AuthType Basic
AuthName "RT Server"
AuthBasicProvider ldap
AuthzLDAPAuthoritative Off
AuthLDAPBindDN "domainName\someExistingADUser"
AuthLDAPBindPassword passwordForThatUser
AuthLDAPURL ldap://address.of.your.domain.controller:389/ou=Users,dc=some,dc=name,dc=ofyourdomain?sAMAccountName?sub?(objectClass=*)
</Location>
<LocationMatch "/rt/NoAuth">
Satisfy Any
Allow from all
</LocationMatch>
<LocationMatch "/rt//REST/1.0/NoAuth">
Satisfy Any
Allow from all
</LocationMatch>
e em RT_SiteConfig.pm add:
Set($WebExternalAuth , 1);
Set($WebFallbackToInternalAuth , 1);
Set($WebExternalAuto , 1);
reinicie o apache e espere pelo melhor:]