Open ports on router suddenly closed

  1.    #1

    Open ports on router suddenly closed


    Hello,

    I have a Windows 10 machine with D-link DSL-225 router.

    I've opened a few port in the router's interface and it worked for more than a year. Lately I noticed that the ports I opened are now closed and I can't figure out why.

    When I check them with Advanced Port Scanner program, and I use the laptop's local ip they show as open. When I type the external ip they are closed.


    Any ideas?

    I've tried so many things by now that I'm 100% lost.


    p.s. I even called the ISP to ask if they close the port but apparently not.

    p.s.2. When I scan the external ip, it only shows 1 open port when I scan "All TCP ports 1-65535".
      My ComputerSystem Spec

  2. bro67's Avatar
    Posts : 5,847
    Mac OS High Sierra 10.14.3 Beta (18D21c)
       #2

    That is because the “Router” places those ports into stealth mode, along with closing the ones that are not in use. The ports that you want traffic to go through are always in stealth mode. Port 80 remains open outbound, but closes it to unsolicited traffic, so that malware cannot creep in unwatched.
      My ComputerSystem Spec

  3.    #3

    bro67 said: View Post
    That is because the “Router” places those ports into stealth mode, along with closing the ones that are not in use. The ports that you want traffic to go through are always in stealth mode. Port 80 remains open outbound, but closes it to unsolicited traffic, so that malware cannot creep in unwatched.

    So what can I do?
    Why does the router has Port Forwarding if it doesn't work?

    Even using DMZ still shows the ports as closed.
      My ComputerSystem Spec

  4. bro67's Avatar
    Posts : 5,847
    Mac OS High Sierra 10.14.3 Beta (18D21c)
       #4

    Nothing. It is normal for ports to appear closed while stealthed.
      My ComputerSystem Spec

  5. Compumind's Avatar
    Posts : 732
    Windows 10 Pro x64, Various Linux Builds, Internet Security Specialty.
       #5

    bro67 said: View Post
    Nothing. It is normal for ports to appear closed while stealthed.
    Correct.

    I will also add this:

    FREE Port Scanner | SolarWinds

    FWIW
      My ComputerSystem Spec

  6.    #6

    bro67 said: View Post
    Nothing. It is normal for ports to appear closed while stealthed.
    So how can I unstealth them?

    Compumind said: View Post
    Correct.

    I will also add this:

    FREE Port Scanner | SolarWinds

    FWIW
    I used this:
    https://www.advanced-port-scanner.com/
      My ComputerSystem Spec

  7. bro67's Avatar
    Posts : 5,847
    Mac OS High Sierra 10.14.3 Beta (18D21c)
       #7

    No you cannot take them out of stealth mode. It is normal behavior for what you are seeing.
      My ComputerSystem Spec

  8.    #8

    The thing with ports is there must be something to answer or it goes nowhere its like knocking on your front door if your not in there is no answer
      My ComputerSystem Spec


 

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