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  1. The official definition from Windows Internals 6th Edition: The System process (process ID 4) is the home for a special kind of thread that runs only in kernel mode a kernel-mode system thread.

    Windows Processes part 2(Investigating PID 4) - HACKLIDO

    hacklido.com/blog/62-windows-processes-part-2investigating-pid-4
    hacklido.com/blog/62-windows-processes-part-2investigating-pid-4
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  2. People also ask
    Is PID 4 a system?
    When I look up the process in task manager, it shows PID 4 is SYSTEM, that's it. No extension... nothing. Just " SYSTEM ". What's going on here? I'm afraid to end this process, what do I do? Same question at superuser superuser.com/questions/352017/pid4-using-port-80 and superuser.com/questions/43307/…

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

    stackoverflow.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
    Is PID 4 a Windows service?
    From this answer and a blog post I figured that anything to do with PID 4 is probably a Windows Service, so you may want to look for the relevant services in services.msc. Also, this process is run by System, which is considered another "logged-on" user.

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

    stackoverflow.com
    What is the PID for system?
    The PID for System is always 4. What does this process do exactly? The official definition from Windows Internals 6th Edition: The System process (process ID 4) is the home for a special kind of thread that runs only in kernel mode a kernel-mode system thread.

    Windows Processes part 2(Investigating PID 4) - HACKLIDO

    hacklido.com
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  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
    Why Port 443 is being used by System Process with PID 4Dec 22, 2016
    Process Explorer: How to find out what System PID 4 isMar 31, 2014
    See more results

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    How do I determine what is using port 80? - Microsoft …
    answers.microsoft.com
    "Why is System PID 4 having so much disk activity?"
    answers.microsoft.com
    Apache : How to Solve port 80 is occupied problem on …
    howtosolutions.net
    windows - PID:4 using Port 80 - Super User
    superuser.com
    Recommended to you based on what's popular • Feedback
  4. Microsoft Community
    https://answers.microsoft.com/en-us/windows/forum/...

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

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    High disk Usage with PID 4? | Tom's Hardware Forum
    forums.tomshardware.c…
    High disk usage (100%) coming from System process (PID …
    reddit.com
    Recommended to you based on what's popular • Feedback
  5. Question & Answer
    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…
    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
    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 …
    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 am having problems starting my Apache server, because port 443 is already in use. It turns out, the system proces…
    Answer · 20 votes
    Run the following from an elevated command prompt: netstat -ab
    Stack Overflow
    Question
    Process Explorer: How to find out what System PID 4 is.
    Using Process Explorer I can see that a certain file is locked by "…
    Answer · 0 votes
    I found the answer here: Windows 2008 R2 - Kernel (System Proces…
    Stack Overflow
    Question
    Why Port 443 is being used by System Process with PID 4.
    Why Port 443 is being used by System Process with PID 4, (nto…
    Answer · 9 votes
    Try this: Run net stop http - this will stop the http service (and dependant …
    Super User
    Question
    Using Process Explorer I can see that a certain file is locked by "System, PID: 4". This blocks the VB.NET VS2012 IDE fr…
    Answer · 3 votes
    It's the Windows Kernel. This virtual process contains all running ker…
    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 …
  6. 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 not a …

    • Reviews: 8

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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
      Recommended to you based on what's popular • Feedback
    • Microsoft Community
      https://answers.microsoft.com/en-us/windows/forum/...

      PID 4 - High disk activity - What and why? - Microsoft Community

      Tags:
      High Disk Activity
      Pid in Disk
      Search Disk Activity By Pid
    • Super User
      https://superuser.com/questions/736699

      Process Explorer: How to find out what System PID 4 is

      Tags:
      Windows System Pid 4
      File Locked By System Pid 4
      Find Pid 4
    • Super User
      https://superuser.com/questions/125455

      Why is the 'System' process listening on port 443? - Super User

      Tags:
      Windows System Pid 4
      Microsoft Windows
      Port 443 Not Listening
      Pid 443
    • Super User
      https://superuser.com/questions/352017

      windows - PID:4 using Port 80 - Super User

      Tags:
      Windows System Pid 4
      Pid 4 Listening Port 80
      System Is Using Port 80
    • hacklido.com
      https://hacklido.com/blog/62-windows-processes...

      Windows Processes part 2(Investigating PID 4) - HACKLIDO

      Tags:
      Windows System Pid 4
      Process Id 4
    • Server Fault
      https://serverfault.com/questions/800339/high...

      High network utilization - System Process - PID 4 - Server Fault

    • spiceworks.com
      https://community.spiceworks.com/t/high-network...

      High network utilization - System Process - PID 4

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