# DB01001: Connection Failed

## What This Means[​](#what-this-means "Directe link naar What This Means")

The POS could not connect to its local database. WCPOS uses a local database to store products, customers, and other data for fast access and offline functionality.

## Common Causes[​](#common-causes "Directe link naar Common Causes")

* **Storage full** — Device has no storage space left
* **Database corrupted** — Local database files are damaged
* **Permission issue** — App doesn't have storage permissions
* **Browser storage disabled** — IndexedDB is disabled (web version)

## How to Fix[​](#how-to-fix "Directe link naar How to Fix")

### 1. Check Storage Space[​](#1-check-storage-space "Directe link naar 1. Check Storage Space")

Ensure your device has available storage:

* Free up space if storage is full
* Delete unused apps or files
* Check available disk space

### 2. Clear App Data[​](#2-clear-app-data "Directe link naar 2. Clear App Data")

Reset the local database:

* **Desktop app:** Look for "Clear Data" in settings
* **Web browser:** Clear site data for the POS domain
* **Note:** This will require re-syncing all data

### 3. Check Browser Settings (Web)[​](#3-check-browser-settings-web "Directe link naar 3. Check Browser Settings (Web)")

If using the web version:

1. Ensure IndexedDB is enabled
2. Don't use private/incognito mode (limited storage)
3. Allow the site to store data

### 4. Check Permissions[​](#4-check-permissions "Directe link naar 4. Check Permissions")

On desktop:

* Ensure the app has permission to write to its data directory
* Check if antivirus is blocking database access

### 5. Reinstall the App[​](#5-reinstall-the-app "Directe link naar 5. Reinstall the App")

If other solutions fail:

1. Uninstall the POS app
2. Restart your device
3. Reinstall the app
4. Login and sync data

## Data Recovery[​](#data-recovery "Directe link naar Data Recovery")

If you have unsaved data:

* The app may have pending changes that couldn't be synced
* Contact support if you need help recovering data
* In most cases, data can be re-synced from the server

## Related Errors[​](#related-errors "Directe link naar Related Errors")

* [DB01002](/nl/error-codes/DB01002.md) — Query Timeout
* [SY01002](/nl/error-codes/SY01002.md) — Disk Full