I have a few questions and I’m not that smart with computers but I’ll try to explain it the best I can.
Firstly I’m trying to setup my printer on my network so all of the computers on the network can print to it. I’ve done this successfully but cannot print while Comodo Firewall is enabled. Once I disable the firewall it prints fine with no problems.
The second problem I’m having is kind of similar to the first. I play Call of Duty: Modern Warfare 2 on the PC and whenever I play with the firewall on my NAT type is strict. Yes, I’ve tried forwarding my ports but either way whenever I play with the firewall enabled it’s strict. When I turn the firewall of my NAT type is open.
For the printer problem. You can make your local network a trusted zone.
First look up your IP address and subnet mask. In Windows go to Start → Run → cmd → enter → ipconfig → enter → now lookup your IP address and subnet mask.
Second create a zone in My Network Zones (Firewall → Common Tasks). Choose Add → A New Network Zone → fill in a name like My local network → Apply. Now select My Local Network Zone → Add → A new address → choose An IP Address Mask → fill in your local IP something like 192.168.1.x usually and your subnet mask; usually 255.255.255.0 → Apply. Now check and see the new network defined. Exit using Apply.
Now we are going to use the Stealth Ports Wizard to make your local network a trusted network (Firewall → Common Tasks):
Choose “Define a new trusted network and stealth my ports to EVERYONE else” → Next → choose “I would like to trust an existing My Network Zone” → choose your local network zone from the drop down box at the bottom → Finish.
Now check your Global Rules and see your network added.
Not sure how you forwarded ports but the following described in principle how it works.
The default Global Rules changed from being alerted for incoming traffic on a per case basis to a general block of all incoming traffic (default Stealth).
Open the needed ports in Global Rules following:
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.