# File lib/active_ldap/connection.rb, line 239
    def retrieve_connection
      conn = self.class.active_connections[dn]
      return conn if conn

      config = self.class.configuration(dn)
      return nil unless config

      conn = self.class.instantiate_adapter(config)
      @connection = self.class.active_connections[dn] = conn
      conn
    end