2 Replies Latest reply: Sep 10, 2013 3:58 PM by kazgor RSS

    MWG 7.2 with NTLM authentification google issue


      Hi All


      We have the issue with google pages.

      If client try to get google page, the "authentication required" page is recieved by MWG with following line:


      HTTP/1.1 407 authenticationrequired Via: 1.1 (McAfee Web Gateway Content-Type:

      text/html Cache-Control: no-cache Content-Length: 2742 Proxy-Connection: Keep-Alive Proxy-Authenticate:




      If we bypass the authentication rules, everything goes good.


      We have this issue only with google pages (others are without problem) and time to time (same machine).



      Our configuration:

      MWG (appliance)

      Authetification: NTLM

      Client: Windows 7,XP,2008

      IE 8,9,10



      I made the tcpdump on MWG for both scenario


      gnoauth.pcap - authentication rules are bypassed

      gauth.pcap - authentication rules are enabled


      ( - WebGateway IP, - Client IP)


      Thank you for every suggestion

        • 1. Re: MWG 7.2 with NTLM authentification google issue



          from what I can see in the dump everything looks fine. The browser asks for google.cz, MWG answers with 407 and provides possible authemtication schemes (NTLM, Basic). The browser asks for google.cz again setting up NTLM (NTLMSSP_NEGOTIATE message). MWG correctly sends a 407 with NTLMSSP_CHALLENGE message, then the browser does not continue. The browser now has to contact MWG again and send NTLMSSP_AUTH message in order to finish NTLM authentication, but the packet capture does not contain this request.


          It could be a problem of browser/OS or an invalid response sent by MWG which I didn't notice. I recommend filing an SR with support to have this checked. From what I can see MWG works as expected.




          • 2. Re: MWG 7.2 with NTLM authentification google issue

            Hi Andre


            Thank you for response.

            It looks like that traffic is influenced by antivirus on clients PCs.