Null desktop id results in error 467:Unknown

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        // Converting servlet request to http servlet request
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // Retrieve http session
        final HttpSession session = request.getSession();

        final String authMessage = request.getHeader("Authorization");

        // Check the special IE POST request with Authorization header containing
        // type-1 message (see method javadoc)
        if (reAuthOnIEPost(request) && authMessage != null && authMessage.startsWith("NTLM ")) {
            logger.debug("POST Request with NTLM Authorization detected.");
            // decode the NTLM response from the client
            byte[] src = Base64.decode(authMessage.substring(5));
            // see if a type 1 message was sent by the client
            if (src[8] == 1) {
                logger.debug("NTLM Authorization header contains type-1 message. Sending fake response just to pass this stage...");
                Type1Message type1 = new Type1Message(src);
                // respond with a type 2 message, where the challenge
                // is null since we don't care about the server response
                // (type-3 message) since we're already authenticated
                // (This is just a by-pass - see method javadoc)
                Type2Message type2 = new Type2Message(type1, new byte[8], null);
                String msg = Base64.encode(type2.toByteArray());
                response.setHeader("WWW-Authenticate", "NTLM " + msg);
                response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
                response.setContentLength(0);
                response.flushBuffer();

                return;
            }
        }

        filterChain.doFilter(servletRequest, servletResponse);
    }