DevOps & Cloud
Risk: Low
Port 4318 — OpenTelemetry OTLP HTTP Receiver
Port 4318 is the official port for OpenTelemetry Protocol (OTLP) telemetry ingestion over HTTP/JSON and Protobuf, widely used in web frontend instrumentation and serverless functions.
PORT NUMBER
4318
PROTOCOL
TCP
DEFAULT PROCESS
otelcol, otelcol-contrib
FIREWALL TARGET
4318/tcp
Instant Terminal Fixes for Port 4318
macOS & Linux Terminal
1. Check who is listening on port 4318:
curl -I http://localhost:4318/v1/traces2. Kill process occupying port 4318 (EADDRINUSE fix):
sudo systemctl stop otel-collector || kill -9 $(lsof -t -i:4318)3. UFW Firewall Allow rule:
sudo ufw allow 4318/tcpWindows PowerShell (Admin)
1. Check listening port:
Get-NetTCPConnection -LocalPort 43182. Force kill process on port 4318:
Stop-Process -Id (Get-NetTCPConnection -LocalPort 4318).OwningProcess -Force3. Docker Port Forwarding Mapping:
docker run -d -p 4318:4318 otel/opentelemetry-collector:latestCommon Error Encountered
Failed to export traces to http://localhost:4318/v1/traces: Connection refused.
Security Advisory & Hardening
Configure rate limiting and body size limits in the collector pipeline to avoid telemetry denial-of-service.
Frequently Asked Questions
Port 4318 Questions & Answers
Common questions regarding default services, kill commands, and firewall configurations.
Port 4318 is commonly used for OpenTelemetry OTLP HTTP Receiver. Port 4318 is the official port for OpenTelemetry Protocol (OTLP) telemetry ingestion over HTTP/JSON and Protobuf, widely used in web frontend instrumentation and serverless functions.