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457 Views 2 Replies Latest reply: Sep 10, 2013 3:58 PM by kazgor RSS
kazgor Newcomer 2 posts since
Sep 5, 2013
Currently Being Moderated

Sep 5, 2013 1:38 PM

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

  • asabban McAfee SME 1,354 posts since
    Nov 3, 2009
    Currently Being Moderated
    1. Sep 9, 2013 3:00 AM (in response to kazgor)
    Re: MWG 7.2 with NTLM authentification google issue



    from what I can see in the dump everything looks fine. The browser asks for, MWG answers with 407 and provides possible authemtication schemes (NTLM, Basic). The browser asks for 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.




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