PORT 4566 / TCPInfrastructure & CloudExposure Risk: Low
Port 4566: LocalStack AWS Emulator — LocalStack Unified AWS Edge Gateway
Single entry-point edge port emulating AWS S3, Lambda, DynamoDB, SQS, and SNS locally in Docker.
Default Service
LocalStack AWS Emulator
Process: python / localstack
Transport Protocol
TCP
IANA Registered Port 4566
Docker Port Flag
-p 4566:4566
Container to Host Mapping
How to Check & Kill Process on Port 4566 (EADDRINUSE Fix)
macOS & Linux (lsof / kill)
# Find process using port 4566 sudo lsof -i :4566 # Instantly kill process on port 4566 lsof -ti:4566 | xargs kill -9
Windows (PowerShell & CMD)
# Find PID listening on port 4566 netstat -ano | findstr :4566 # Force kill by PID taskkill /PID <PID_NUMBER> /F
Cross-Platform Node.js One-Liner
# Kill port 4566 via npx npx kill-port 4566 # Or diagnose via Castov CLI npx castov fix "EADDRINUSE :::4566"
Linux Firewall (UFW) & Connectivity Test
# Test if port 4566 is reachable nc -zv localhost 4566 # Allow or deny port 4566 in UFW sudo ufw allow 4566/tcp
CLOUD & INFRASTRUCTURE PARTNER2 Slots Open
Deploying High-Availability Cloud Servers, VPCs, or Managed Databases?
Reach backend engineers and SREs actively debugging ports, CIDR subnets, and production infrastructure.
Frequently Asked Questions about Port 4566
What is Port 4566 used for?
Port 4566 is the standard network port for LocalStack AWS Emulator (LocalStack Unified AWS Edge Gateway) operating over TCP. The typical system daemon or process is python / localstack.
How do I kill a process running on Port 4566 (EADDRINUSE)?
On macOS and Linux, run: lsof -ti:4566 | xargs kill -9 (or npx kill-port 4566). On Windows PowerShell/CMD, run: netstat -ano | findstr :4566 and then taskkill /PID <PID> /F.
Is it safe to expose Port 4566 to the internet?
Port 4566 has a Low security risk profile. Single entry-point edge port emulating AWS S3, Lambda, DynamoDB, SQS, and SNS locally in Docker.