Internet gradually loses connection...attacked?

Discussion in 'other security issues & news' started by R2D2, Sep 6, 2006.

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  1. R2D2

    R2D2 Registered Member

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    Recently, my internet connection would work fine but after about 15-20 minutes of surfing, the connection would gradually cut-off. At first, I noticed some images wouldn't properly load on webpages then very soon the connection is completely lost. Could this be a buffer overflow? I have guessed it's possibly my degrading memory card (PC is about 7 years old :cool: ) Could that be the culprit?

    I'm not familiar with all symptoms of a buffer overflow or denial of service. The buffers are set at 40 in my config.sys (Win9:cool:, I guess that's normal. I don't think a buffer overflow would change that setting. Any ideas?
     
  2. nadirah

    nadirah Registered Member

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    Memory card? I'm not quite sure as to exactly which component you are referring to. Shouldn't it be the graphics card/ on-board graphics( if your computer uses integrated graphics)?

    All right, lets do it step-by-step.

    I rule out the possibility of a buffer overflow, degrading graphics card or a D-O-S attack at this stage.

    You are using Win 9x. Am I right or wrong?
    Which internet browser are you using?
    What type of internet connection are you on?
    Do you have a firewall?
    Have you recently installed any additional software programs or changed any hardware component?
    Is your version of Windows updated with all the latest patches? NOTE: Microsoft has discontinued support for older versions of Windows.
    Have you scanned your computer for any malware, and, if so, are your anti-spyware or anti-virus programs up to date?
     
  3. R2D2

    R2D2 Registered Member

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    Hello nadirah,

    Yes, it's Win 98
    I'm using the latest version of Firefox with cable
    ZA firewall
    I recently installed Kaspersky anti-virus 6.0 but I don't think that's the cause
    and it's updated. I did a thorough scan with it and CounterSpy, no threats detected.
    Fortunately, the internet works fine now but was curious to what caused the problem.

    Jeff
     
  4. sevr

    sevr Registered Member

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    I think you were victim of SYN-FLOOD or other FLOOD.

    Do you seen anormal packets drops in log of ZA ?
     
  5. R2D2

    R2D2 Registered Member

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    Hi sevr,

    Yes, that could be.
    I see TCP (flags:S) outgoing under protocol in my ZA log, and a few UDP incoming if I remember, but all were blocked. There hasn't been any recent ZA activity.

    Jeff
     
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