Web & Dev
Risk: Low
Port 4200 — Angular CLI Dev Server
Port 4200 is the default port used by Angular CLI (`ng serve`) during frontend application development.
PORT NUMBER
4200
PROTOCOL
TCP
DEFAULT PROCESS
node, ng
FIREWALL TARGET
4200/tcp
Instant Terminal Fixes for Port 4200
macOS & Linux Terminal
1. Check who is listening on port 4200:
lsof -i :42002. Kill process occupying port 4200 (EADDRINUSE fix):
kill -9 $(lsof -t -i:4200)3. UFW Firewall Allow rule:
sudo ufw allow 4200/tcpWindows PowerShell (Admin)
1. Check listening port:
Get-NetTCPConnection -LocalPort 42002. Force kill process on port 4200:
Stop-Process -Id (Get-NetTCPConnection -LocalPort 4200).OwningProcess -Force3. Docker Port Forwarding Mapping:
docker run -p 4200:4200 -d my-angular-appCommon Error Encountered
Port 4200 is already in use. Use '--port' to specify a different port.
Security Advisory & Hardening
Development server only. If 4200 is busy, launch with `ng serve --port 4300`.
Frequently Asked Questions
Port 4200 Questions & Answers
Common questions regarding default services, kill commands, and firewall configurations.
Port 4200 is commonly used for Angular CLI Dev Server. Port 4200 is the default port used by Angular CLI (`ng serve`) during frontend application development.