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Connection issues

Use this guide when Test Connection fails or the builder shows authentication errors.

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”Set API key in Impossible Settings”

Cause: Settings are incomplete or Test Connection has not succeeded. Fix:
  1. Go to Impossible → Settings
  2. Paste your API Key (from the web app Dashboard → API Keys)
  3. Click Test Connection and wait for “Connection successful”
  4. Save settings

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”Invalid or revoked API key”

Cause: The API key is wrong, was revoked, or never completed validation. Fix:
  1. Go to the Impossible web app → Dashboard → API Keys
  2. Generate a new key
  3. Copy the key (it is shown only once)
  4. In WordPress, go to Impossible → Settings
  5. Paste the new key and click Test Connection
  6. Save

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Test Connection fails (401)

Cause: Key may be revoked, incorrect, or the web app cannot validate it. Fix:
  • Generate a new API key in the web app
  • Ensure you pasted the full key (no extra spaces)
  • Check that the web app and orchestrator are running (for self-hosted setups)

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Test Connection fails (network)

Cause: The orchestrator is not reachable from your WordPress server. Fix:
  • For production: ensure your WordPress server can reach https://api.impossible.sh (check firewall, proxy)
  • For local dev: if using ngrok, ensure Site URL Override is set to your tunnel URL
  • If using a reverse proxy, ensure the site URL in WordPress matches what the orchestrator expects

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Builder loads but prompts fail (401)

Cause: The plugin has not stored the site secret. This can happen after a new install or if Test Connection was never run successfully. Fix:
  1. Go to Impossible → Settings
  2. Click Test Connection again
  3. Wait for “Connection successful”
  4. Save
  5. Refresh the builder and try a prompt again
If you use a reverse proxy or custom domain, ensure the WordPress site URL matches what the orchestrator expects.

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Production security

  • Do not set WPA_DEV_MODE in wp-config.php in production
  • Use Test Connection so the plugin uses proper authentication for all requests
  • Keep your API key private
For local development only, you can add define('WPA_DEV_MODE', true); to wp-config.php to skip authentication during testing. Never use this in production.