Good day
I have one strange problem with Comodo Firewall.
I have installed only Firewall (no Antivirus) and without Defense+, just pure Firewall.
After the installation I set the application “Unreal Tournament.exe” as Trusted aplication (Firewall → Define a new trusted application), but still, Comodo blocks some behaviour of that application.
I found someone with the same problem here:
https://forums.comodo.com/help-for-v3/comodo-with-utunreal-tournament-classic-aka-99-t25634.15.html
But, moreover, it happens to me also with the application FileZilla Server, described exactly, everything runs properly, no obvious interference of Comodo with the application, no PopUp messages or alerts.
Just noone can connect to me.
That one app is also set as Trusted.
Why I am so sure, that is the problem of Comodo?
I tried to exit the firewall by right clicking on some icon, but that didn’t helped. Huh. Then I found the sneaky ■■■■■■■, “cmdagent.exe” and killed him manually via the Windows Task Manager.
Then Finally!! all worked properly.
Is there any way, how to enforce the Comodo to: “DO NOT TOUCH my trusted applications!” ??
Or any other way how to solve this problem?
Windows XP SP3 32-Bit
Comodo Firewall v. 4.0.135239.742
Any help, ideas, comments or requests for further information will be highly appreciated.
Thank you.
Killing cmdagent is effectively stopping the firewall. 
Guess that’s not what we want… O0
You need to open a port for incoming traffic in Global Rules. Read the following on how to do that for a random port and apply it to the ports needed for the used applications.
To open the port TCP 1723 for example
First step is to determine the MAC or Physical address of you network connector. Go to Start → Run → cmd → enter → a black box will show up and enter the following → ipconfig /all (notice the space before /all) → enter → now look up the Physical address and write it down.
Notice that Physical address = MAC address
Firewall → Advanced → Network Security policy → Global Rules → Add → fill in the following:
Action: Allow
Protocol: TCP
Direction: In
Description: Incoming Port
Source address: Any
Destination Address: Choose MAC address and fill in the found MAC/Physical address
Source Port: Any
Destination Port: 1723
Then push Apply → Now make sure that the new rule is somewhere above the basic block rule(s) as the bottom (the block rules have red icons); you can drag and drop the rules → Ok.
Oh, thank you very much! Now it works! 
I had to install some Network monitor to search the ports, that actually application uses, but that was all the difficult work. Your advice really helped.
I have to tell about this clear solution to some friends (well, also just beginner users of firewall), having the similar problem…
If somewhere in your profile was a “Donation” button, I would really like to donate, because a kind of job you do, should be well awarded.
May be I could start making a living out of this…
The problem at hand is that the default Global Rules changed with v4. In the old situation the user would get alerted for incoming traffic, In v4 there is block all incoming traffic rule. Now rules needs to be added to Global Rules to allow incoming traffic.
I have the tutorial in my notes. Notes is one of the convenient things of using Opera browser; makes live easier.