OpenClaw Gateway Won't Start: Every Fix (2026)

⚠️ The Problem

The OpenClaw gateway fails to start or crashes immediately after starting. You might see:

bash

Port 18789 is already in useENOSPC: no space left on devicegateway closed (1006 abnormal closure)

Or the service shows as "activating" but never becomes "active".

Several things can prevent the gateway from starting:

Another gateway is already running — Often the old clawdbot service after an upgrade
Port conflict — Something else is using port 18789
Disk full — No space to write config or logs
Telegram connection failure — Gateway crashes on startup trying to connect
Invalid config — Syntax error in openclaw.json

First, run the doctor command to diagnose:

bash

openclaw doctor --fix

Check for duplicate services (common after upgrading from clawdbot):

bash

systemctl --user list-units | grep -E 'clawdbot|openclaw|gateway'pgrep -af 'openclaw|clawdbot'

If you find old services, stop and disable them:

bash

systemctl --user stop clawdbot-gateway.servicesystemctl --user disable clawdbot-gateway.service

Check disk space:

bash

df -h

If disk is full, clean up old logs:

bash

rm -rf /tmp/openclaw/openclaw-*.log

Try starting the gateway manually to see errors:

bash

openclaw gateway start --foreground

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Command	Description
openclaw doctor --fix	Diagnose and fix common issues
openclaw gateway status --deep	Detailed gateway status
openclaw gateway start --foreground	Start with visible logs
lsof -i :18789	Check what's using the port