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VirusScan's active protection needs to compare notes with a central database plus the Security Center updater checks every few minutes for updates in general. So yes, don't cut off internet access. It shouldn't be necessary anyway.
If you don't want to allow internet access for a while turn the machine off rather than set firewalls to abnormal settings which can cause a whole bunch of issues.
Thanks for the reply, Ex_Brit.
I'll do as you suggest in future although I'm still left a bit puzzled. I've been using McAfee for about four years now in exactly the same way I described and never seen anything peculiar happen as a result of locking down the firewall before the scan. Now, suddenly, it happens on both my machines :confused:.
I never really thought of firewall lockdown as being an abnormal setting - just a security option that could be selected when desired.
This suggests to me that something may have changed in McAfee that has made locking-down more of an issue. If that is the case perhaps it would be useful if McAfee published something (if only in Help) to tell users not to lockdown before a scan. I've certainly not come across anything to that effect anywhere.
Anyway, as I say, I'll leave it unlocked next time and see how things go. Thanks again for the response.
The fact that there is never any update log to tell us what has changed has been the subject of much feedback from us, to no avail I'm afraid.
Try it at normal settings for a while see how things go.
FYI it's still protecting during a scan.
I should have added that, in the current version, a new feature called "Active Protection" was added. It "phones home" if something unknown is discovered and compares notes with an online database.
That could be what is the culprit here. It can be turned off if you wish, but then one layer of protection is removed.
To configure it on SC9.3 & later, double-click the taskbar icon to open Security Center
Click Advanced Menu (bottom left)
Click Configure (left)
Click Computer & Files (top left)
Click Advanced (right)
Select Active Protection (left)
You can turn it off at the right.
Thanks for the added info.
Unfortunately, these options are not things that can be 'played with' quickly and easily for investigative purposes. Scheduled scans take a bit too long for that.
Active Protection sounds a distinct possibility for the source of the problem but, as you say, disabling the new feature would remove one layer of security so I'm inclined to leave it in place for now and try leaving the firewall unlocked for future scans.
If any issues remain (or if I find myself with a lot of spare time on my hands - most unlikely), I may come back to this and try disabling the feature but otherwise I'll go ahead with the unlocked firewall.
I'll get back here after my next scheduled scan and report what happened. I'm guessing the problem will not recur.
Let's hope so and good luck. I'll leave this open until otherwise advised.
Latest scheduled scan just completed on my desktop in around 45 minutes - more like old times! The laptop is still scanning but is making good progress.
Looking at the icon for the internet connection on screen, I did see it flash into life occasionally as the scan progressed so there was obviously some communication taking place.
Looks like keeping the internet connection open has cured the problem.
Thanks for the help, Ex_Brit and please feel free to close this thread at your convenience.
Thanks and good luck.