PORT 11434 / TCPDev & LocalhostExposure Risk: Medium

Port 11434: Ollama Local LLM — Ollama Local AI Model Server REST API

Default local HTTP API port for running Llama 3, Mistral, DeepSeek, and Qwen models via Ollama.

Default Service

Ollama Local LLM

Process: ollama

Transport Protocol

TCP

IANA Registered Port 11434

Docker Port Flag

-p 11434:11434

Container to Host Mapping

How to Check & Kill Process on Port 11434 (EADDRINUSE Fix)

macOS & Linux (lsof / kill)

# Find process using port 11434
sudo lsof -i :11434

# Instantly kill process on port 11434
lsof -ti:11434 | xargs kill -9

Windows (PowerShell & CMD)

# Find PID listening on port 11434
netstat -ano | findstr :11434

# Force kill by PID
taskkill /PID <PID_NUMBER> /F

Cross-Platform Node.js One-Liner

# Kill port 11434 via npx
npx kill-port 11434

# Or diagnose via Castov CLI
npx castov fix "EADDRINUSE :::11434"

Linux Firewall (UFW) & Connectivity Test

# Test if port 11434 is reachable
nc -zv localhost 11434

# Allow or deny port 11434 in UFW
sudo ufw allow 11434/tcp

Frequently Asked Questions about Port 11434

What is Port 11434 used for?

Port 11434 is the standard network port for Ollama Local LLM (Ollama Local AI Model Server REST API) operating over TCP. The typical system daemon or process is ollama.

How do I kill a process running on Port 11434 (EADDRINUSE)?

On macOS and Linux, run: lsof -ti:11434 | xargs kill -9 (or npx kill-port 11434). On Windows PowerShell/CMD, run: netstat -ano | findstr :11434 and then taskkill /PID <PID> /F.