PORT 4318 / TCPInfrastructure & CloudExposure Risk: Low
Port 4318: OpenTelemetry Collector (HTTP) — OTLP over HTTP/Protobuf & JSON Ingestion
Standard port for sending OpenTelemetry traces and metrics over HTTP/1.1 or HTTP/2 without gRPC.
Default Service
OpenTelemetry Collector (HTTP)
Process: otelcol / jaeger
Transport Protocol
TCP
IANA Registered Port 4318
Docker Port Flag
-p 4318:4318
Container to Host Mapping
How to Check & Kill Process on Port 4318 (EADDRINUSE Fix)
macOS & Linux (lsof / kill)
# Find process using port 4318 sudo lsof -i :4318 # Instantly kill process on port 4318 lsof -ti:4318 | xargs kill -9
Windows (PowerShell & CMD)
# Find PID listening on port 4318 netstat -ano | findstr :4318 # Force kill by PID taskkill /PID <PID_NUMBER> /F
Cross-Platform Node.js One-Liner
# Kill port 4318 via npx npx kill-port 4318 # Or diagnose via Castov CLI npx castov fix "EADDRINUSE :::4318"
Linux Firewall (UFW) & Connectivity Test
# Test if port 4318 is reachable nc -zv localhost 4318 # Allow or deny port 4318 in UFW sudo ufw allow 4318/tcp
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Frequently Asked Questions about Port 4318
What is Port 4318 used for?
Port 4318 is the standard network port for OpenTelemetry Collector (HTTP) (OTLP over HTTP/Protobuf & JSON Ingestion) operating over TCP. The typical system daemon or process is otelcol / jaeger.
How do I kill a process running on Port 4318 (EADDRINUSE)?
On macOS and Linux, run: lsof -ti:4318 | xargs kill -9 (or npx kill-port 4318). On Windows PowerShell/CMD, run: netstat -ano | findstr :4318 and then taskkill /PID <PID> /F.
Is it safe to expose Port 4318 to the internet?
Port 4318 has a Low security risk profile. Standard port for sending OpenTelemetry traces and metrics over HTTP/1.1 or HTTP/2 without gRPC.