* clearListeners.
         */
        Runnable task = requireNonNull(curr.task);
        if (task instanceof SetFuture) {
          SetFuture<?> setFuture = (SetFuture<?>) task;
          // We unwind setFuture specifically to avoid StackOverflowErrors in the case of long
          // chains of SetFutures
          // Handling this special case is important because there is no way to pass an executor to

                if (logger.isDebugEnabled()) {
                    logger.debug("Logged in as Bind DN. {}", context);
                }
                isBind = true;
            } catch (final Exception e) {
                logger.warn("LDAP configuration is wrong.", e);
            }
        }
        return isBind;
    }

    public OptionalEntity<FessUser> login(final String username, final String password) {

        Name calledName = new Name(tc.getConfig(), this.address.firstCalledName(), 0x20, null);
        do {
            this.socket = new Socket();
            if ( this.localAddr != null )
                this.socket.bind(new InetSocketAddress(this.localAddr, this.localPort));
            this.socket.connect(new InetSocketAddress(this.address.getHostAddress(), 139), tc.getConfig().getConnTimeout());