CIS Problems after Windows 10 Upgrade

CIS Product Version

Report on a bug which results in a not correctly working CIS in Windows 10.

You should never try to update a system to Windows 10 with CIS installed. It will not work properly. It will not execute rules properly. It won’t even protect you properly. And when you try to reinstall it over an existing (migrated) CIS installation in your Windows 10 installation, it may even destroy your Windows 10 installation beyond repair.

Before you upgrade to Windows 10 you need to uninstall CIS and install it again after the migration to Windows 10 was successful.

These are the results of several tests conducted on machines with a Windows 7 Ultimate installation which I tried to update to Windows 10 Professional.

First thing I noticed was an error message from CIS, telling me that the firewall wasn’t working correctly. Clicking on the “Fix” button seemed to repair the problem. But I soon found out that it did not.

E.g. global rules did no longer work correctly which had worked perfectly before on the original Windows 7 system.

You need to know, that if you want to check this yourself, you need to move the rule you want to test to the top of the list. This is because the rule at the top overrules other rules that are on the second, third, … position in that list.

I would be happy to receive your comments!



Not only CIS but you should uninstall any installed security software to upgrade to Win 10… this is a better & more safe approach.

You are right!

Actually, the best way is a completely clean install.

Quote from

[i]If you are upgrading to the free Windows 10 … , you will be able to reinstall, including a clean install, on the same device. You won’t need a product key for re-activations on the same hardware. If you make a meaningful change to your hardware, you may need to contact customer support to help with activation. You’ll also be able to create your own installation media like a USB drive or DVD, and use that to upgrade your device or reinstall after you’ve upgraded.

You do not get a product key with the free upgrade of Windows 10.

The activation for the free offer of Windows 10 is registered on the Microsoft activation servers, and is referenced by the hardware (motherboard/CPU/graphics card) of the PC it was upgraded on.[/i]

End of quote

I just tried it and it works.