Port 6379 (TCP) — Redis / Valkey In-Memory Store
TCP/6379 serves ultra-low-latency caching, session storage, pub/sub messaging, and rate-limiting queues for Redis and Valkey clusters (with cluster bus on 16379).
| Port Number | 6379 |
|---|---|
| Transport Protocol | TCP |
| Primary Service | Redis / Valkey In-Memory Store |
| Standard / Specification | RESP Protocol |
| IANA Port Range | Registered User Port (1024–49151) |
| Internet Exposure Risk | Severe RCE/cryptomining target if exposed; historically designed for trusted private networks. |
Firewall Architecture & Hardening Best Practices
Never attach a public IP to Redis. Enable ACL users (requirepass / Redis 6+ ACLs), enable TLS where supported, and restrict TCP/6379 strictly to internal microservice security groups.
Operational Troubleshooting Note
Verify protected-mode yes is active so misconfigured bindings refuse unauthenticated external interfaces automatically.
Quick CLI Connectivity & Firewall Reference
# Test TCP/6379 reachability (Linux / macOS / PowerShell) nc -zv target.example.com 6379 Test-NetConnection -ComputerName target.example.com -Port 6379 # Allow restricted CIDR on Linux UFW firewall ufw allow from 10.0.0.0/8 to any port 6379 proto tcp
Planning firewall allowlists or VPN overlays? Use our IPv4 CIDR Calculator, MTU & TCP MSS Calculator, or WireGuard AllowedIPs Generator.
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