How to configure Comodo Firewall accepting a VPN connection


Can someone provide me with the instructions to configure the Comodo Firewall? (I have DISABLED the Winodws 8.1 firewall)
I want to allow a VPN connection to make contact with my (desktop)system.

  1. I managed to install RDP and have it working on my LAN (So internal everything is working correct with RDP)
  2. I also have configured my Router to accept a VPN connection and a connection can me made, only the Comodo Firewall is blocking the connection.
    2.a)) I checked the correct working of the VPN connection by disabling the Comodo Firewall . Then VPN has access to my system AFTER I have disable the Comodo Firewal. (But that is typically not what one prefers)

How to configure the firewall to accept the incoming VPN connection that is the question :)?
Thanks in advance and Regards
Hans de Cocq

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How to configure the firewall to accept the incoming VPN connection that is the question ?
only the Comodo Firewall is blocking the connection.
I did not read no where a problem between vpn and firewall (Lan / RDP).

i have found a link :

i do not know if it can help you or if i have really understand your problem.

this article :
Just to confirm, you stated you cannot remote desktop into your office computer which is joined to a Microsoft Windows Server 2003 domain. In an effort to troubleshoot your issues, let’s check the following:

  1. Ensure that when the VPN is established you can open a command prompt and PING to the target Windows Sever 2003 / work machine and confirm whether or not you can get the desired IP address from the reply.

  2. If the test is fine above, telnet to port 3389 (standard RDP port) to test whether it can successfully connect. Again, this command is to be run from within command prompt. “C:>telnet 3389” (Without the quotations and where is substituted by your actual FQDN (Fully Qualified Domain Name) or External IP address. The result of this command should give just a blank screen if you are successful. If the port is not open, you’ll get an error message.

  3. Check all firewall and anti-virus applications that may be running on the Windows 7 machine. As a troubleshooting method, disable all firewalls.

  4. If possible, attempt to connect to the server / work machine in question from within your network from the Windows 7 machine. Performing this troubleshooting step will indicate whether or not the issue is VPN specific. If the connection from within the network fails, it is likely not VPN specific.

  5. You may also want to ensure that your VPN client computer has the latest version of Remote Desktop Connection installed. For additional information you may find the following Microsoft KB article “Description Remote Desktop Connection 7.0 client update” helpful

As a final recommendation, you may find the following Microsoft resources “Why can’t I connect using Remote Desktop Connection” and the TechNet blog article “Troubleshooting common VPN related errors” beneficial.


and this one :

I managed to install RDP and have it working on my LAN
so i supposed that it is about remote desktop on Lan - at home - with vpn.

Sorry if i did an error or create a misunderstanding …



Thanks for your suggestions, but that doesn’t answer my question.
To access my desktop trough a VPN (from the outside world e.g. The Internet-WAN) is the next step. The configuration of a VPN client isn’t the problem either.
The Comodo firewall is blocking the access of my Desktop from the outside world.

The question is: How to configure Comodo to allow an incoming VPN trough port 3389.


but port 3389 is not it port vpn ?

i read and read on several site and i repeat it : i do not read that a firewall prohibit an incoming VPN through port 3389 …
i think that maybe it is not the firewall but the network you must configure first - as soon as it is done, the rules of the firewall accept it as safe … or the firewall tell you that it is insecure (your soft or you way to manage your connections) and block your connections protecting your computer.

Allowing a connection from a firewall : see guide / tutorial / firewall and for the network-vpn you can see on your vpn site where all is explained or done in an automatic way …

Sorry to not be able to help you.

For an inbound external connection, you will need to make a GLOBAL RULE (Firewall) allowing inbound access.

From memory, the criteria is as follows,
Direction - IN
Protocol - TCP
Action - ALLOW
Source IP - ANY

One important thing here is that you PC must have a static IP address assigned to it. This is needed so your router forwarding rule and you CIS global firewall rule have a fixed ‘target’.

Sorry I can’t be more precise at the moment but I’m not near a CIS system at the moment.

Hope this helps,
Ewen :slight_smile:


Thanks, one problem here I do not have a Static IP. Is there some possibility to use a DNS Name as far as you know?

Again Thanks

Do you mean your WAN address is not static? If so, this will pose a problem as the destination address for your VPN connection will change.

The only way around this, AFAIK, is to use DynDNS. Try No-IP Free - Dynamic DNS - Create a Free DDNS Account Now - No-IP.

Ewen :slight_smile:

I’d set the rule as:

Action - Allow
Protocol - TCP (Or whichever protocol it needs)
Direction - In
Source Address - Type: Any Address
Destination Address - Type: MAC Address | MAC Address: Your MAC address
Source Port - Type: Any
Destination Port: Type: A Single Port | Port: 3389

Better - thanks for that.

The OP may face a greater problem if he really does not have a static public IP.

Ewen :slight_smile:

Thanks the both of you Mrreow and Ewen. I will give it a try on Monday when I’m back.

highly regards Hans

Hey Guys

Thanks you for your advices and YES, it is working now!!
I Can connect with my iPad to my desktop and have a surprisingly quick response while using my PC-Desktop through the VPN on my iPad.

Highly regards :wink: :smiley: :-TU
Hans de Cocq