Home page logo
/

educause logo Educause Security Discussion mailing list archives

Re: McAfee preventing Windows 7 logons
From: "Smith, Bob" <smithrj () LONGWOOD EDU>
Date: Thu, 11 Oct 2012 09:28:56 -0400

Sorry for the delay in responding to the list on this issue, but it seems our techs have isolated the problem to 
something associated with our install of the OS through our imaging process.  When we manually install the OS and then 
install McAfee the problem is non-existent.  However, when we install using our image of the OS and then add McAfee the 
problem surfaces.  So this may not even be a McAfee problem per se.

Thanks for all the replies and suggestions.  If anyone is interested you can email off-list and I will gladly share our 
findings once they are finalized.

Bob

From: The EDUCAUSE Security Constituent Group Listserv [mailto:SECURITY () LISTSERV EDUCAUSE EDU] On Behalf Of Eric 
Lukens
Sent: Monday, October 08, 2012 2:42 PM
To: SECURITY () LISTSERV EDUCAUSE EDU
Subject: Re: [SECURITY] McAfee preventing Windows 7 logons

I too have had multiple problems with A/V (two different A/V companies even) causing issues with C:\Users\Default. In 
my case, there wasn't even a false positive, but for whatever reason the scanner got hung up in there long enough that 
Windows got annoyed. Adding an exclusion for real-time scanning to C:\Users\Default fixed the problem.

-Eric
On Mon, Oct 8, 2012 at 12:41 PM, Schoenefeld, Keith P. <Keith_Schoenefeld () baylor edu<mailto:Keith_Schoenefeld () 
baylor edu>> wrote:
What happens if you do a complete scan of the entire C:\Users\Default directory?  Since the contents of that directory 
are effectively copied into a new directory when a new user is created, a false positive detection would cause an 
issue.  In addition, if McAfee is taking action that is blocking it and you aren't seeing it on an ePO server, it seems 
like it's either a bug in the software or a configuration setting that needs to be toggled so that blocks are being 
reported back to ePO (or logged locally).  As an additional troubleshooting technique, you could probably turn on 
auditing (for both success and failure) on an affected system, and see what's being blocked and what's being allowed 
when a new user logs on.

-- KS

Keith Schoenefeld
Information Security Analyst
Baylor University
254-710-6667<tel:254-710-6667>

From: The EDUCAUSE Security Constituent Group Listserv [mailto:SECURITY () LISTSERV EDUCAUSE EDU<mailto:SECURITY () 
LISTSERV EDUCAUSE EDU>] On Behalf Of Smith, Bob
Sent: Monday, October 08, 2012 9:47 AM
To: SECURITY () LISTSERV EDUCAUSE EDU<mailto:SECURITY () LISTSERV EDUCAUSE EDU>
Subject: [SECURITY] McAfee preventing Windows 7 logons

We are experiencing what appears to be a growing problem with Windows 7 and McAfee 8.8 preventing logons via AD.  There 
isn't much information to provide since we have been unable to see any logged activity either in Windows or in the 
McAfee logs to help diagnose the problem, yet when we disable the Access Protection feature the logons will proceed 
normally.  The other odd behavior we are seeing is that this seems to only affect new users/logons.  For example, 
existing users who had successfully logged on to the computer previously (either prior to installing or upgrading to 
McAfee 8.8) do not have the problem.  We believe that McAfee (or something else?) is preventing the creation of new 
profiles in the c:\users directory.

Some of the workarounds being used are safe mode booting, let the user logon (basically creates the profile), and then 
reboot in normal mode after the profile is created on the computer.  We also tried putting in an exception for the 
c:\users directory and the logons can proceed normally.

If someone has experienced this problem and has a viable solution we would like to hear from you.

Thanks.

Bob Smith
AVP IITS & Information Security Officer
Longwood University
www.longwood.edu/infosec<http://www.longwood.edu/infosec>






--


Eric C. Lukens

IT Security Policy and Risk Assessment Analyst

ITS-Network Services

Curris Business Building 15

University of Northern Iowa

Cedar Falls, IA 50614-0121

319-273-7434

http://www.uni.edu/elukens/


  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]
AlienVault