Defense+ blocking access to Windows system DLLs by Windows systems apps!

Help for v3
1

So I installed Comodo 3, and, after things settled down a bit (after various learning phases), I discovered that Defense+ was blocking access by Windows to various Windows DLLs.

For example, if I right-click on “My Computer” or on the desktop, and select “Properties”, I get a popup with the message:

RUNDLL: Error Loading C:\Windows\system32\shell32.dll
Access is denied.

The Defense+ activity log says:

Application: rundll32.exe
Action: Create Process, Execute Image
Target: C:\Windows\system32\ntdll.dll (and sometimes shimeng.dll)

This is in “Clean PC” mode. I have to entirely disable Defense+ for this to work.

Do you know why Defense+ would be identifying these sorts of operations as restricted? And how can we fix this?

  • Tim
2

This has never happened to me in any of the Comodo 3.0 releases. There are several posts about this and most related to user error. You probably clicked block on a D+ alert instead of Alllow. You can look in your D+ settings and see whats blocked or else just to a complete uninstall and reinstall. Be sure your are using the most current release.

http://www.personalfirewall.comodo.com/download_firewall.html

3

Hi there, and thanks for your suggestions…

Yes, I believe I may have clicked on the wrong thing. I checked, and found that I had selected “Isolated Application” instead of “Trusted Application”. My mistake, I thought that “Isolated” meant that it was separate, not that it should be isolated from the system. D’oh! :slight_smile:

  • Tim
4

(CLY)

5

So has this changed since the first realease of v3?

I ask because I had a similar problem - clicked on something that seemed logical at the time!
Trouble was, I couldn’t open CFP because CFP wouldn’t allow me to!

How does one get round that? Even in Safe Mode I couldn’t change whatever was blocked (but did manage to run the uninstaller :frowning:

6

There is nothing wrong with Comodo. Just read all pop ups and don’t just go click happy.

7

I do tend to become click-happy when there are lots of warnings popping up.

With v2 it was in part because the alerts didn’t really tell me much; with v3 it was because some of the choices are ambiguous - I might have clicked on ‘installer’ whilst installing something.

Basically though, there should be no possibility whatsoever of being locked out of almost all apps. etc. just by making a wrong decision.

8

Being locked out can happen with any firewall. I can duplicate it with Zone Alarm.