First, I figured out why the Remote Desktop Settings don’t work
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) installation, after you upgraded, it will 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.
I just used a test PC and a test installation, so, no damage done. Hope others will read this before making a fatal mistake. I contacted Comodo support. I received some answers, but they did not solve the problem. And nobody told me that an upgrade won’t work properly.
Here are the answers to futuretech’s questions:
Are you using the same firewall rules and settings that worked on Windows 7?
Is there anything being blocked in the firewall logs?
For the global rule, did you apply it to both TCP and UDP or just one of the other?
First I used what worked in Windows 7 (the original migrated settings):
Added a global rule to allow TCP stream coming through port 3389 and put it at the top of the list because what’s at the top will overrule what’s below.
Second I changed “Block IP in From MAC Any To MAC Any Where Protocol Is Any” to “Allow” and I moved it to the top.
Both rules were not executed by CIS
What application handles RDP connections?
I use standard remote desktop connection of Windows. In this case I used a Windows 7 PC to access my test PC which I upgraded to Windows 10. And please note, the remote desktop connection worked fine with the original Windows 7 installation on that very test PC. After the upgrade to Windows 10, connection could only be established with the firewall deactivated. Once the connection was successful I could activate the firewall again.