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  1. Question & Answer
    Super User
    Question
    My Google-fu has failed me! On Linux, the process with the lowest PID is init with PID 1, since it is the first process that gets st…
    Answer · 7 votes
    You'll notice that all of the PIDs are divisible by 4. 4 is therefore the first PID …
    Stack Overflow
    Question
    Port 80 is being used by SYSTEM (PID 4), what is that?
    I am trying to use port 80 for my application server, but when I perfo…
    Answer · 302 votes
    There are many services, which can listen port 80 on windows. Luckily yo…
    Stack Overflow
    Question
    Port 8081 is being used by SYSTEM (PID 4), how to stop that.
    I have a case where One vulnerability detected in server(dusx…
    Answer · 8 votes
    Run the command; netsh http show servicestate view=requestq This will …
    Server Fault
    Question
    Recently I noticed some of our machines are getting sluggish, mainly after boot-up. Using the Resource Monitor I dete…
    Answer · 28 votes
    This is an older question, but I had this issue, and for me it was SuperFetc…
    Super User
    Question
    I was trying to install Zend Server CE on my computer but when I got to the point were I need to choose the port for my …
    Answer · 90 votes
    Ok, after searching the web for a while I found a solution to my problem. …
    Super User
    Question
    I am running Windows 7 RC1. I have multiple issues getting IIS to work on my system and today when I installed a new a…
    Answer · 28 votes
    This post on Getting Apache to run on port 80 on Windows 7 (internet …
    Server Fault
    Question
    I am trying to use port 80 for my application server, but when I perform "netstat -aon" I get TCP 0.0.0.0:80 0.0.0.0:0 LIS…
    Answer · 22 votes
    Although people are pointing out specific services (e.g. the "Web …
    Super User
    Question
    My hard disk drive is constantly, incessantly active so long as my computer is on. Mostly this doesn't seem to aff…
    Answer · 0 votes
    Just about anything could be hiding behing that, as the System thread is res…
    Stack Overflow
    Question
    Windows Process from PID.
    I'm trying to determine which application or system program is using a parti…
    Answer · 6 votes
    PID 4 is the system process - if PID 4 is holding a port open, it m…
    Stack Overflow
    Question
    Are the "System" and "System Idle Process" PIDs constant on Windows?
    On a couple of windows XP systems I'v…
    Answer · 3 votes
    I have production code which assumes these PIDs are static, and it w…
  2. Microsoft Community
    https://answers.microsoft.com/en-us/windows/forum/...

    "Why is System PID 4 having so much disk activity?"

    See results only from answers.microsoft.com
  3. Stack Overflow
    https://stackoverflow.com/questions/1430141

    Port 80 is being used by SYSTEM (PID 4), what is that?

    Code sample

    sc stop "MsDepSvc"
    sc config "MsDepSvc" start= disabled
    Are the "System" and "System Idle Process" PIDs constant on Windows?Apr 14, 2010
    XAMPP Port 80 in use by "Unable to open process" with PID 4
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    How do I determine what is using port 80? - Microsoft …
    answers.microsoft.com
    Apache : How to Solve port 80 is occupied problem on …
    howtosolutions.net
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  4. People also ask
    Is PID 4 accessing everything?
    Using the Resource Monitor I detected excessive disk access from the system process with PID 4. Following some tips, I disabled the anti-virus on the System Volume Information folder, hoping it will help (I don't want to disable system restore). However, it seems like PID 4 is accessing everything.

    System process (PID 4) constantly accessing the hard disk

    serverfault.com
    What is the cause of PCOD?
    primaryExpertImage

    Dr. Anet Varghese

    Doctor of Medicine (MBBS) · 1 years of exp

    PCOD(polycystic ovarian disease) is a hormonal disorder in women where ovaries produce multiple immature eggs which, over time, become cysts on the ovaries leading to more imbalances in hormone levels. Causes includes a positive family history, insulin resistance and overweight, low grade inflammation and excess androgen.
    Q&A: Polycystic Ovary Syndrome
    microsoftstart.msn.com
    What is PID 4?
    PID 4 is the Process ID for the Windows SYSTEM process. It's a lot like PID 1 on Unix systems, in fact. A lot of services run under PID 4. Don't services run under their own processes? Anyway, even if that is so, why is it ordinary file accesses in regular non-service processes are mostly done under PID 4?

    System process (PID 4) constantly accessing the hard disk

    serverfault.com
    Is PID 4 causing performance degradation?
    As you can see on the screenshot PID 4 is associated with all users and various apps. This is resulted in noticeable performance degradation. I tried to use Process Monitor but this the SMSS is only process I can see under PID 4. Active time most of the time is above 70% and Disk Queue length most of the time is higher than 1.

    System PID 4 high disk activity - Microsoft Q&A

    learn.microsoft.com
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  5. Server Fault
    https://serverfault.com/questions/4190…

    System process (PID 4) constantly accessing the hard disk

    WEBAug 19, 2012 · After cancelling the operation, PID 4 keeps accessing the file for around 30 seconds, reading many MBs per second. This is …

    • Reviews: 8
      High network utilization - System Process - PID 4
      Port 80 is being used by SYSTEM (PID 4), what is that?
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      PID 4 - High disk activity - What and why? - Microsoft …
      answers.microsoft.com
      Solved - "System" process = 100% disk usage | Windows 8 …
      eightforums.com
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    • Super User
      https://superuser.com/questions/1182187

      windows - Why is System PID 4, not PID 1? - Super User

      Tags:
      System Pid 4
      Pid Controllers
      Windows 10 Pid 4
      Pid in Operating System
    • Microsoft Community
      https://answers.microsoft.com/en-us/windows/forum/...

      High Disk usage from system.exe with PID 4 - Microsoft Community

    • Super User
      https://superuser.com/questions/352017

      windows - PID:4 using Port 80 - Super User

      Tags:
      System Pid 4
      Windows Who Is Using Port 80
      Windows 10 Pid 4
    • Super User
      https://superuser.com/questions/877117

      Win7 System Process (PID 4) constantly accessing drive

      Tags:
      System Pid 4
      Windows Pid 4
    • stackoverflow.com
      https://stackoverflow.com/questions/53724188

      Port 8081 is being used by SYSTEM (PID 4), how to stop that

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