What is port 6379 used for?

Port 6379 is the standard TCP port used for Redis In-Memory Cache. It is commonly used by Redis, Valkey, KeyDB, Sidekiq, BullMQ. Default port for Redis in-memory data store, cache, and message broker.

How do I check if port 6379 is open?

Enter your public IP or hostname into the scanner tool and click Check. A sub-second raw TCP socket handshake will be initiated from our edge server to port 6379 on your target. If the 3-way handshake finishes with SYN-ACK, the port is OPEN. If an RST packet is returned, the host is reachable but the port is CLOSED. If packets time out without response, the port is FILTERED by an ISP or firewall.

Why does port 6379 show as closed or filtered?

If port 6379 reports CLOSED or FILTERED, confirm that: 1) Your service is actively running and bound to 0.0.0.0 (not just localhost/127.0.0.1); 2) Your router has a port forwarding rule directing external port 6379 to your machine's local IP; 3) Your operating system firewall (Windows Defender Firewall, ufw, or iptables) allows incoming connections on port 6379.

PORT 6379 TCP Database Critical Risk

Port 6379 (Redis In-Memory Cache) Open Check

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

Exposing port 6379 carries elevated security risks (Critical risk). Extremely dangerous to expose to public WAN. Redis is designed for internal trusted networks; unauthenticated exposure allows remote code execution via CONFIG SET and SSH key injection. For remote services, consider placing them behind a secure VPN (such as WireGuard or Tailscale) or restricting inbound access with strict IP firewall rules.

Default port for Redis in-memory data store, cache, and message broker.

Live Socket Reachability Probe

Pre-configured for Port 6379

Port Scanner

Quick:

Recent Probes 0

Stored locally in browser • 0 logs on server

No recent scans recorded.

Target hosts and tested ports will appear here automatically for fast 1-click re-testing.

Auto-prunes oldest probes beyond 10 entries (FIFO)

Port Specifications & Network Behavior

Standard Port Number 6379

Primary Service Redis In-Memory Cache

Transport Protocol TCP

Traffic Classification Database

Residential ISP Status Typically unrestricted by consumer ISPs

Security Exposure Critical Exposure discouraged without VPN or firewall protection

Security Advisory: Redis In-Memory Cache (Port 6379)

Extremely dangerous to expose to public WAN. Redis is designed for internal trusted networks; unauthenticated exposure allows remote code execution via CONFIG SET and SSH key injection.

Recommendation: Keep port 6379 closed to WAN traffic. Connect remotely using WireGuard, Tailscale, or an SSH tunnel.

Port Forwarding & Troubleshooting Checklist

If port 6379 returns CLOSED or FILTERED, work through this verified diagnostic checklist:

1 By default Redis runs in protected-mode and binds to 127.0.0.1. Do not expose directly to WAN.
2 If necessary for inter-server communication, configure strong 'requirepass' and bind to specific private IP.
3 Inspect redis.conf for 'bind' directives.

Verify Host Is Listening Locally

Windows (PowerShell) netstat -ano | findstr :6379

Linux / macOS (Bash) ss -tulpn | grep :6379