PORT 5433 / TCPDatabase & CacheExposure Risk: High
Port 5433: PostgreSQL Alternate Instance — Secondary PostgreSQL Cluster or PgBouncer
Standard secondary port when running multiple PostgreSQL versions side-by-side or tunneling a staging database locally.
Default Service
PostgreSQL Alternate Instance
Process: postgres
Transport Protocol
TCP
IANA Registered Port 5433
Docker Port Flag
-p 5433:5432
Container to Host Mapping
How to Check & Kill Process on Port 5433 (EADDRINUSE Fix)
macOS & Linux (lsof / kill)
# Find process using port 5433 sudo lsof -i :5433 # Instantly kill process on port 5433 lsof -ti:5433 | xargs kill -9
Windows (PowerShell & CMD)
# Find PID listening on port 5433 netstat -ano | findstr :5433 # Force kill by PID taskkill /PID <PID_NUMBER> /F
Cross-Platform Node.js One-Liner
# Kill port 5433 via npx npx kill-port 5433 # Or diagnose via Castov CLI npx castov fix "EADDRINUSE :::5433"
Linux Firewall (UFW) & Connectivity Test
# Test if port 5433 is reachable nc -zv localhost 5433 # Allow or deny port 5433 in UFW sudo ufw allow 5433/tcp
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Frequently Asked Questions about Port 5433
What is Port 5433 used for?
Port 5433 is the standard network port for PostgreSQL Alternate Instance (Secondary PostgreSQL Cluster or PgBouncer) operating over TCP. The typical system daemon or process is postgres.
How do I kill a process running on Port 5433 (EADDRINUSE)?
On macOS and Linux, run: lsof -ti:5433 | xargs kill -9 (or npx kill-port 5433). On Windows PowerShell/CMD, run: netstat -ano | findstr :5433 and then taskkill /PID <PID> /F.
Is it safe to expose Port 5433 to the internet?
Port 5433 has a High security risk profile. Standard secondary port when running multiple PostgreSQL versions side-by-side or tunneling a staging database locally.