Home Network Scan showing Router Accessible from Internet

Avast Free Antivirus / Premium Security
1

Comcast Internet (Extreme 150/20mb upload)
Comcast Gateway DPC 3941T (rental)
1 Ethernet PC
No Ports opened
Universal plug and play enabled (default setting)

Now it shows “Your Router is accessible from the internet”, never showed this before, nor have any new firmwire or changes been done that i’m aware of, I can factory reset and reconfigure the gateway if need be, PC was just clean installed less than a week ago to clean it up prior to Christmas and vowed to myself to stick to Avast and not switch from Avast to Defender, back to Avast, and then back to Defender this time

2

That port is very likely open as avast detected.
It is often used by ISP’s to remotely troubleshoot/update/reset the modem/router.

3

And I Probably can’t access that to fix it, and we can’t switch modems since have there Phone service to, so guess nothing I can really do to take care of the issue, I looked in the router settings, but no luck finding area to take care of it lol

4

You likely can change it if you can get access to the OS on the router.
Could be it runs WebOS.

Or install firmware not created for a ISP.

5

What happens when you click on the “Go to the router” button? Also, does anyone here have any experience with calling their cable provider about closing the open port if the user can’t do it?

6

It tries to goto the router settings, and page never loads, so guess nothing I can do there, calling Comcast I don’t think would do any good, as they’d probably be clueless to fix it, at least my experience with Tier 1 Tech support before.

For now i’ll just deal with it I guess, have no choice but to rent there gateway for our service, as they don’t allow your own gateway with phone service in this area.

7

You should be able to get your own router, and have their gateway pass the public IP to your router (bridge mode). Their gateway would still handle the phone and you would have a router you can control.

Most ISP routers are locked down like this, but nearly all have the option of bridge mode.

8

Well if I can afford a Quality router might look into getting separate one, and bridge this gateway. Will look at prices over Christmas when I get hopefully giftcards, and see what I can do in the matter

9

Regarding the port (7547) shown in your screenshot, read here: https://blog.avast.com/avast-home-network-security-scans-routers-to-reveal-weaknesses

10

ISP’s will never close that port if you ask them.
Ofcourse they will come up with all kinds of explanations on why not.

  • It needs to be open so we can help you if there are problems.
  • We need it so we can keep the firmware up-to-date.
    Ofcourse, they never heard about talking someone through a procedure step-by-step :wink:

If you run a IP scan for the private network range, it is almost certain you will find more IP addresses accessible then you would think that there are used.

11

Hi patrick2,
it is really a bit painful to see a report from Home Network Scan in cases when you can hardly do anything about it. Most probably this is also the case here - but as you can read on the block, having this port opened (by the ISP) and not properly secured caused problems for many users in Germany (being offline) just a week ago.

From your original post it seems you would prefere not to see such reports at all. Isn’t it better to have the information and in cases you don’t care or don’t know what to do just ignore the fact?

Thanks - this is a real question. We are really trying to bring some value with the HNS Scans, but frequently it ends like this – we may discover an issue, but some else (ISP, owner of the router in case of public Wifis, etc.) must make the fix - no the user that is running the scan.

Thanks
Lukas.