iis - Port 80 is being used by SYSTEM (PID 4), what is that? - Stack Overflow
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Port 80 used by System. - Microsoft Community
System error when installing XProtect: 'The IIS uses port 80, but this port is also used by the process...' (troubleshooting)
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Port 80 (HTTP) vs. Port 443 (HTTPS): Everything You Need to Know
KAS Simulator won't run because port 80 is used | Kollmorgen
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Why Port 80 is Being Used by System Process ID 4, What's going on with your Windows Machine ? - NEXTOFWINDOWS.COM
Ports used by TeamViewer - TeamViewer Support
windows - XAMPP - Port 80 in use by "Unable to open process" with PID 4! 12 - Stack Overflow
Ubuntu 22.04 open HTTP port 80 and HTTPS port 443 with ufw - Linux Tutorials - Learn Linux Configuration
IIS Manager Error: The process cannot access the file because it is being used by another process. (Exception from HRESULT: 0x80070020) | issuesandfixes
Solved: qlik sense upgrade issue, powershell error "Powers... - Qlik Community - 1922692
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PID4 (system32/ntoskrnl.exe) blocking the port 80 - Support - Local Community
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apache - Port 80 is blocked by 'System' - Stack Overflow
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