System is trying to connect to another computer

I’m wondering if this is normal to have a popup like this from comodo. I connected to the internet and it says this. I couldn’t decide if it’s allow or deny and after a while it disappeared. Can anyone helP?

Do you have a screenshot of the alert?

If it disappeared, that just means the popup timed up. It should happen again if the same thing occurs.

I don’t have an image. The latest one is this:

System is trying to receive a connection from the internet
IP address - UDP
port: nbname(137)

Is it safe? I didn’t do anything again and so the popup disappeared after a while.

The IP address is a local IP address and could be of your modem/router. To see what address your your modem/router (default gateway)is do the following. Open the command prompt (Start → cmd → enter) → now fill in: ipconfig /all → look up the address of the default gateway.

Port 137 is used by NETBIOS for looking up the computer’s name. NETBIOS facilitates sharing data on your local network.

How do I get it to show up again? I think by not answering “block” or “deny” it may have decided by itself.
Also, I’m seeing that people are recommending to set the system to outgoing only. Why is that?

I just tried your cmd to look at my IP addressed and am now looking at the blocked intrustion section of comodo’s network defense. I see that it has blocked “intrusion attempts”. The source IP seems to be my default gateway and the source destination seems to be my own IP address (as per the results from running “cmd”). Should I allow these? If so, how should I do it?

Sorry I’m not asking the brightest quesitons. I don’t know much about computers.

I need some extra information. What type of connection are you on? Do you have a router in your network? I assume you share the connection with others. Is that correct?

Can you please show a screenshot of your Firewall logs? They can be found under Firewall → Common Tasks → View Firewall Alerts.

Not sure if you need this but here it is. How to post a screenshot?

When the window you want the screenshot is active push alt+print screen. The window is now copied to the clipboard. Paste the image in any image editing program, Paint,, the Gimp etc, and save the file as 32 bits png image.

At the forum push the reply button. Or when using the Quick reply type some text and push the preview button.

Underneath the text box click on Additional options. Push the Choose button and navigate to the file and select it. When you want to post more images click on the more attachments link.

When done typing push the Post or Preview button.

Well, sort of. If you don’t answer in the amount of time before the window times out, (closes) it will automatically block the request. It only creates a temporary rule though, so the next time the same event happens, you will get another alert.

I have a wireless connection. I do have a router/modem. sorry, but i’m still having trouble getting the screenshot, but it’s exactly this:

Application/action/protocol/ source IP / source port/ source destination / destination port
system / blocked / / P / / /

Hope this will be helpful.

Please help.

Port 137 asking access to System is NETBIOS resolving your computer’s name on the local network. NETBIOS is used by Windows to share files and folders over the local network between computers. It depends on what you want to do with your network if you want to allow it. Blocking it will get in the way when you share on the local network.

I’m not sure about sharing on the local network. Do you mean that it will share my files with the computers in my vincinity or just the ones who are using the same internet connection (same router/modem)? I could just use instant messaging to send files over though.

But basically if I block it my internet connection will not be affected, right?

File sharing is allowing another computer on your network to access files/folders on your machine. If you aren’t doing that, there shouldn’t be a problem.