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Thread: [security] How do you check your open ports / active connections to protect you?

  1. #1
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    [security] How do you check your open ports / active connections to protect you?

    netstat -plntu
    lsof -i -n -P
    host
    nmap -sS -sV 127.0.0.1
    wireshark

    ...
    stuffs like that ...

    Which one can tell you the active connections and lot of details ?
    Level1: (406327 , 1000) = ? found ?

  2. #2
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    Re: [security] How do you check your open ports / active connections to protect you?

    just open firestarter and you can see a lot of info on what is open and what connections you have
    First they ignore you.Then they laugh at you. Then they fight you.Then you win.Gandhi
    Linux para las masas
    Resistance Is Futile. You Will Be Assimilated!

  3. #3
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    Re: [security] How do you check your open ports / active connections to protect you?

    What about the online test - "Shields Up"?
    https://www.grc.com/x/ne.dll?bh0bkyd2

  4. #4
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    Re: [security] How do you check your open ports / active connections to protect you?

    Code:
    sudo apt-get install iftop
    iftop
    terminal stats for all active network connections
    "Kreed" - Download/File Server - AMD Sempron 3000+ / 768MB / nVidia 6200GT - Ubuntu 9.04
    "Muter" - Work Laptop - Dell Latitude D830 / Core 2 Duo 2.4GHz / 2048MB / Nvidia 140NVS - Ubutnu 9.04

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    Talking Re: [security] How do you check your open ports / active connections to protect you?

    Quote Originally Posted by emarkay View Post
    What about the online test - "Shields Up"?
    https://www.grc.com/x/ne.dll?bh0bkyd2
    They say I have a very secure windows computer

    your Internet port 139 does not appear to exist!
    One or more ports on this system are operating in FULL STEALTH MODE! Standard Internet behavior requires port connection attempts to be answered with a success or refusal response. Therefore, only an attempt to connect to a nonexistent computer results in no response of either kind. But YOUR computer has DELIBERATELY CHOSEN NOT TO RESPOND (that's very cool!) which represents advanced computer and port stealthing capabilities. A machine configured in this fashion is well hardened to Internet NetBIOS attack and intrusion.
    Unable to connect with NetBIOS to your computer.
    All attempts to get any information from your computer have FAILED. (This is very uncommon for a Windows networking-based PC.) Relative to vulnerabilities from Windows networking, this computer appears to be VERY SECURE since it is NOT exposing ANY of its internal NetBIOS networking protocol over the

    But since I am not using a windows computer
    First they ignore you.Then they laugh at you. Then they fight you.Then you win.Gandhi
    Linux para las masas
    Resistance Is Futile. You Will Be Assimilated!

  6. #6
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    Re: [security] How do you check your open ports / active connections to protect you?

    "Your system has achieved a perfect "TruStealth" rating. Not a single packet — solicited or otherwise — was received from your system as a result of our security probing tests. Your system ignored and refused to reply to repeated Pings (ICMP Echo Requests). From the standpoint of the passing probes of any hacker, this machine does not exist on the Internet. Some questionable personal security systems expose their users by attempting to "counter-probe the prober", thus revealing themselves. But your system wisely remained silent in every way. Very nice."
    "Kreed" - Download/File Server - AMD Sempron 3000+ / 768MB / nVidia 6200GT - Ubuntu 9.04
    "Muter" - Work Laptop - Dell Latitude D830 / Core 2 Duo 2.4GHz / 2048MB / Nvidia 140NVS - Ubutnu 9.04

  7. #7
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    Re: [security] How do you check your open ports / active connections to protect you?

    now someone try this with a Windows computer; what does it say if you do that?

  8. #8
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    Re: [security] How do you check your open ports / active connections to protect you?

    I didn't think ports were OS specific ..

    [now where's that cynical smirking smiley???]

  9. #9
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    Re: [security] How do you check your open ports / active connections to protect you?

    I was going to recommend Steve Gibson's Shield's Up too

    I would also recommend Steve Gibson and Leo Laporte's weekly Security Now podcast - available on the www.twit.tv network - very, very good if you're at all interested in surfing safely etc

  10. #10
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    Re: [security] How do you check your open ports / active connections to protect you?

    Quote Originally Posted by maniacmusician View Post
    now someone try this with a Windows computer; what does it say if you do that?
    Mine says (with the "All service ports" test, AND with my (Windows, Comodo, and Router) firewall disabled)

    Your system has achieved a perfect "TruStealth" rating. Not a single packet — solicited or otherwise — was received from your system as a result of our security probing tests. Your system ignored and refused to reply to repeated Pings (ICMP Echo Requests). From the standpoint of the passing probes of any hacker, this machine does not exist on the Internet. Some questionable personal security systems expose their users by attempting to "counter-probe the prober", thus revealing themselves. But your system wisely remained silent in every way. Very nice.

    And with the Common Ports Probe, still with Firewall disabled:

    I get the same message with
    There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!
    bext to each port.

    and for the File Sharing test:

    Attempting connection to your computer. . .
    Shields UP! is now attempting to contact the Hidden Internet Server within your PC. It is likely that no one has told you that your own personal computer may now be functioning as an Internet Server with neither your knowledge nor your permission. And that it may be serving up all or many of your personal files for reading, writing, modification and even deletion by anyone, anywhere, on the Internet!
    Your Internet port 139 does not appear to exist!
    One or more ports on this system are operating in FULL STEALTH MODE! Standard Internet behavior requires port connection attempts to be answered with a success or refusal response. Therefore, only an attempt to connect to a nonexistent computer results in no response of either kind. But YOUR computer has DELIBERATELY CHOSEN NOT TO RESPOND (that's very cool!) which represents advanced computer and port stealthing capabilities. A machine configured in this fashion is well hardened to Internet NetBIOS attack and intrusion.
    Unable to connect with NetBIOS to your computer.
    All attempts to get any information from your computer have FAILED. (This is very uncommon for a Windows networking-based PC.) Relative to vulnerabilities from Windows networking, this computer appears to be VERY SECURE since it is NOT exposing ANY of its internal NetBIOS networking protocol over the Internet.
    Cool.

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