Firewall Test Site

Avast Free Antivirus / Premium Security
1

Hi,

I try to test my pc firewall with online firewall test. - NMAP.

http://hackertarget.com/nmap-scan/

But it keeps showing me port 23 is open on my computer. Even though I have Avast Internet Security Trial on Windows XP.

Why?

Thank

Xiuc

2

Are you using a router? Port 23 is telnet and is often left open for remote configuration of the router. Avast! can only deal with ports that are actually controlled by your computer.

3

Thank u

You are correct. The port scanner @ http://hackertarget.com was hitting my router that is a “NAT” device. I did some reading. 8)

Unless I port forward then no external packets go through to the internal pc.

4

I don’t see why that site needs your email address & Ip

This is a great site for testing. http://www.grc.com/x/ne.dll?rh1dkyd2

Telnet ----Time Warner etc use this port to update firmware & files.
The port is closed & secure.
You can not stealth it.
The companies are fully aware of these pipelines & wouldn’t think they would allow a hacker to use this port.

I don’t know whether these companies let you use your own router or not.
Just forget it & happy surfing.

5

My ISP is Time Warner RoadRunner. I use my own router (it’s allowed), and using GRC’s Shields Up shows port 23 as stealthed. All ports test as stealth. Stealthed or closed would both be considered safe, I would think.