Web & Dev
Risk: Low
Port 4000 — Strapi / Hexo / Phoenix Dev Server
Port 4000 is the common default port for static site generators (Hexo, Jekyll), headless CMS frameworks (Strapi), GraphQL Playgrounds, and Elixir Phoenix development servers.
PORT NUMBER
4000
PROTOCOL
TCP
DEFAULT PROCESS
node, strapi, mix
FIREWALL TARGET
4000/tcp
Instant Terminal Fixes for Port 4000
macOS & Linux Terminal
1. Check who is listening on port 4000:
sudo lsof -i :4000 || sudo ss -tulpn | grep ":4000 "2. Kill process occupying port 4000 (EADDRINUSE fix):
kill -9 $(lsof -t -i:4000)3. UFW Firewall Allow rule:
sudo ufw allow 4000/tcpWindows PowerShell (Admin)
1. Check listening port:
Get-NetTCPConnection -LocalPort 40002. Force kill process on port 4000:
Stop-Process -Id (Get-NetTCPConnection -LocalPort 4000).OwningProcess -Force3. Docker Port Forwarding Mapping:
docker run -p 4000:4000 -d strapi/strapiCommon Error Encountered
Error: Port 4000 is already in use by another process.
Security Advisory & Hardening
Ensure debug admin panels and GraphQL Introspection queries are disabled in production builds.
Frequently Asked Questions
Port 4000 Questions & Answers
Common questions regarding default services, kill commands, and firewall configurations.
Port 4000 is commonly used for Strapi / Hexo / Phoenix Dev Server. Port 4000 is the common default port for static site generators (Hexo, Jekyll), headless CMS frameworks (Strapi), GraphQL Playgrounds, and Elixir Phoenix development servers.