OpenClaw “Gateway Failed to Start” - Complete Fix Guide

Getting “Gateway Failed to Start” when launching OpenClaw? Here’s how to fix it.

Quick Fixes (Try These First)

Fix 1: Kill Existing Process

Another OpenClaw instance might be running:

Mac/Linux

lsof -i :18789 kill -9

Windows

netstat -ano | findstr :18789 taskkill /PID /F

Fix 2: Change the Port

If port 18789 is used by something else:

In your .env file

PORT=18790

Fix 3: Restart Your Computer

Sometimes the simplest fix works. Restart and try again.

Deeper Fixes

Fix 4: Reinstall Dependencies

rm -rf node_modules package-lock.json npm install

Fix 5: Check Node.js Version

OpenClaw requires Node.js 22+:

node —version

If not 22.x, upgrade:

nvm install 22 nvm use 22

Fix 6: Fix Permissions (Mac/Linux)

sudo chown -R $USER:$USER /path/to/openclaw

Fix 7: Clean Install

Nuclear option:

cd .. rm -rf openclaw git clone https://github.com/psteinroe/openclaw.git cd openclaw npm install

Check the Logs

If nothing works, check what’s actually failing:

DEBUG=* npm run start

Look for specific error messages to Google.

FAQ

Q: It was working yesterday, why not now? A: Usually a port conflict or OpenClaw auto-update that broke something.

Q: I’m getting permission denied errors A: Run with sudo, or fix ownership with chown.

Q: Sharp/node-gyp errors during install A: Install build tools: xcode-select —install (Mac) or apt install build-essential (Linux).

The Easy Fix

Stop debugging. Every hour spent troubleshooting Gateway errors is an hour not using OpenClaw.

StartClaw users never see “Gateway Failed to Start” because we handle all infrastructure.

Try StartClaw Free - Skip the errors entirely.