The Bad News: After speaking with Mcafee, they say that blocking DNS.exe and LSASS.exe traffic for port 6660-6669 can cause issues on AD network servers, but they don't recommend unblocking the range. They suggested excluded the executables from scanning but I don't like that solution either.
What if they get infected?
I tested unblocking the IRC CHAT port range from active scanning on two of our dns servers and now my unc access to another DNS server no longer gets me "access denied" errors when I try to make a change on the other server's "scheduled tasks". Hmmm!
The Hopeful News: I have a contact in Microsoft and have dispatched the question to them to resolve the issue for us all. 11,000+ views indicates many have a question about this matter so we might actually get a response within 30 days.
Maybe we will find out we can direct %windir%\system32\DNS.exe and %windir%\system32\LSASS.exe to NOT use that port range, with a registry change, so when they alert the Mcafee client as having used the IRC Chat Ports 6660-6669 we can KNOW they have been infected!
I suspect DNS.exe and LSASS.exe already "roam" other port ranges and when they get blocked they are configured to just try a different range, but I have yet to confirm this anywhere no Microsoft sites. Our best minds are working on it, you are officially in trouble.
In the mean time, if you have a documented solution, you can send an email to me at my Ministry contact form, as I don't have a contact form set up for the http://burwellfamily.us site and I'm not so stupid as to post my email on the internet EVER again.Message was edited by: patrickburwell on 1/6/10 1:31:40 PM GMT-05:00
as I can see from the first post this is a old problem. It hit us only now as we migrated from ePo 4.0 to ePo 4.5 and to the 8.7.0 scanner.
Is there meanwhile a solution other than to configure windows ( http://support.microsoft.com/default.aspx?scid=kb;en-us;812873 ) to reserve this range of ports ?
I forgot to mention that it happens with other applications to ( wget.exe and more ) that do simply ftp and other protocols so it is not a solution to disable port range checks for singel applications.
Ok, we have an update on the request to Microsoft.
Essentially their answer is "Open a service call".
We are unblocking IRC Chat for DNS LSASS because we believe the issue is resulting from the standard ports being overloaded by our internal DOTNet application "cloud".
TIP: When you exclude IRC Chat PORT Range blocking for DNS.exe and LSASS.exe they are STILL SCANNED for viruses - so don't worry.
One of the units has blocked and logged the following:
Threat Source Address: Our Domain Controller
Threat Source Process Name: C:\Program Files\McAfee\SiteAdvisor Enterprise\McSACore.exe
Threat Target User Name: SYSTEM
Threat Target Port Number: 6,666
If I'm reading this correctly our DC tried to communicate via McSACore on port 6666. Why would McAfee SiteAdvisor communicate with our DC or vice versa?
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