How do I kill the process using port 6379?

On macOS & Linux, run: "sudo systemctl stop redis || sudo kill -9 $(sudo lsof -t -i:6379)". On Windows PowerShell (as Admin), run: "Stop-Process -Id (Get-NetTCPConnection -LocalPort 6379).OwningProcess -Force".

Why am I getting "port 6379 already in use" (EADDRINUSE)?

This occurs when another background instance of redis-server or a zombie process is already bound to port 6379. Use the kill commands above to free the port immediately.

Messaging & Cache

Risk: Critical

Port 6379 — Redis In-Memory Key-Value Store

Q: Is Port 6379 safe to expose to the public internet?

Risk level is Critical. CRITICAL: Redis is designed to be accessed by trusted clients inside a secure private network. Publicly exposed Redis instances without passwords (`requirepass`) are regularly compromised by crypto-miners.

Port 6379 is the default port for Redis in-memory cache and message broker. The number 6379 corresponds to the letters "MERZ" on a telephone keypad (named after Italian singer Alessia Merz).

PORT NUMBER

6379

PROTOCOL

TCP

DEFAULT PROCESS

redis-server

FIREWALL TARGET

6379/tcp

Instant Terminal Fixes for Port 6379

macOS & Linux Terminal

1. Check who is listening on port 6379:

redis-cli ping || sudo ss -tulpn | grep 6379

2. Kill process occupying port 6379 (EADDRINUSE fix):

sudo systemctl stop redis || sudo kill -9 $(sudo lsof -t -i:6379)

3. UFW Firewall Allow rule:

sudo ufw deny 6379

Windows PowerShell (Admin)

1. Check listening port:

Get-NetTCPConnection -LocalPort 6379

2. Force kill process on port 6379:

Stop-Process -Id (Get-NetTCPConnection -LocalPort 6379).OwningProcess -Force

3. Docker Port Forwarding Mapping:

docker run -p 6379:6379 -d redis:alpine redis-server --requirepass securepass

Common Error Encountered

Could not connect to Redis at 127.0.0.1:6379: Connection refused

Security Advisory & Hardening

CRITICAL: Redis is designed to be accessed by trusted clients inside a secure private network. Publicly exposed Redis instances without passwords (`requirepass`) are regularly compromised by crypto-miners.

Frequently Asked Questions

Port 6379 Questions & Answers

Common questions regarding default services, kill commands, and firewall configurations.

Port 6379 is commonly used for Redis In-Memory Key-Value Store. Port 6379 is the default port for Redis in-memory cache and message broker. The number 6379 corresponds to the letters "MERZ" on a telephone keypad (named after Italian singer Alessia Merz).

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