Author Topic: How to stealth the closed ports, 513 and 514 tcp  (Read 1482 times)

0 Members and 1 Guest are viewing this topic.

Offline jraju

  • Sr. Member
  • ****
  • Posts: 395
How to stealth the closed ports, 513 and 514 tcp
« on: October 05, 2017, 05:57:04 AM »
Hi, As one , who is using avast free for years would like to ask the router question here. As network scan of avast is on router, i think , that this needs clarification. Avast does not show any vulnerability when scanning the wifi inspector scan or smart scan.
                   But general scan by all ports of shieds up (Grc.com), show those ports 513 and 514, login nd syslog ports are said to be closed but not stealthy.
                   It says , that stealthy is different from closed ports. Does avast scan inner ports in its scan. Avast does shows dns vulnerabiilities in its can. Does it do on internal ports?
 I request that answers may be given to me by some experts, rather than some , who just post just irrelevant answers whey they not only know the answers but just tries to close the open questions, as if they were answered

Offline Pondus

  • Probably Bot
  • ****
  • Posts: 37182
Re: How to stealth the closed ports, 513 and 514 tcp
« Reply #1 on: October 05, 2017, 07:47:52 AM »
Quote
How to stealth the closed ports, 513 and 514 tcp
Most likely those ports are controlled by your ISP

Is it your router, or does your ISP send you a preset router?
Are your router connected to a ISP box with firewall?

To find out, turn off your computer and router firewall then run GRC test again ... same result?

Anyway they are closed so what is the problem?



« Last Edit: October 05, 2017, 07:56:43 AM by Pondus »

Offline jraju

  • Sr. Member
  • ****
  • Posts: 395
Re: How to stealth the closed ports, 513 and 514 tcp
« Reply #2 on: October 05, 2017, 01:56:44 PM »
turn off your computer and router firewall then run GRC test again .
Hi, Pondus, how to turn off router firewall? I am behind my ISP , but the router provider is Dlink . The router is configured by the ISP and i have taken some steps , on vulnerability if i use my ISP service provider's DNS and changed the DNS to google DNS in router. As per avast recommendations, i have changed the admin pw and user pw in the router. I have enabled protection against DOS, denial of service attacks. I have disabled tr069 configuration, by unchecking. This is also a alert by avast to close port 7547. Inspite of all the things, those ports are shown as closed and not stealthy. Is it ok to leave it as it is ?
                       I do not have firewall menu in my router. But i am having NAT menus, which i have not made any changes.
                       Grc.com suggested me to stealth these ports also. But i could not clearly understand their writings on their page. I even tried zone alarm as suggested, which i immediately uninstalled, as it just disabled my windows firewall. But even with it, grc.com test shows both ports as closed but not stealthy. please your advice

Offline Pondus

  • Probably Bot
  • ****
  • Posts: 37182
Re: How to stealth the closed ports, 513 and 514 tcp
« Reply #3 on: October 05, 2017, 02:20:01 PM »
When you run GRC it is testing the first firewall on the network (explained at GRC website) and that is usually a hardware firewall managed by your ISP

You find user guide online for your router, at D-Link website or maybe your ISP


Stealth Ports Or Closed?  >>  http://www.insanitybit.com/2012/05/30/stealth-ports-or-closed/




Offline jraju

  • Sr. Member
  • ****
  • Posts: 395
Re: How to stealth the closed ports, 513 and 514 tcp
« Reply #4 on: October 05, 2017, 02:30:24 PM »
Hi, Pondus , Great reply and link. So, will not bother , as long as avast shows vulnerability. But my query , whether avast scan the all so called ports, I think even grc.com only scans about the first 1000 ports. But i think there are more than 60000 ports? Why this confusing ideas in grc.com.
 The link clearly explained everything.
                           If it is closed and behind your ISP, then one need not worry about the security.  But my concern is when i use my ISP dns, every scan shows me dns hijack vulnerability and shows some hijacked dns sites in foreign places.
                            So , i changed to google DNS

Offline Eddy

  • Avast Evangelist
  • Maybe Bot
  • ***
  • Posts: 31222
  • Watching (over?) you
    • Malware removal, Biljart and other things.
Re: How to stealth the closed ports, 513 and 514 tcp
« Reply #5 on: October 05, 2017, 02:39:16 PM »
There are 65,536 ports numbered 0 - 65535
Overview of many "commonly" used port numbers > https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers