SYNC121: Sync unreachable
What this means
Your store can't be reached right now.
Nothing to do — keep selling. Changes send automatically when the connection returns. If it lasts, check this device's connection and whether your store's website loads.
Your data
Don't clear this device's data — it may hold changes your store doesn't have yet. They send automatically once your store answers.
Troubleshoot
- Keep selling — sales are saved on this device and send automatically once the store answers.
- Check whether the till itself is online: can any other website load from this device?
- Open your store's own website in a browser tab on the same device; if it does not load there either, the site or its hosting is down, not the POS.
- For whoever manages this device's network: if the site loads but the POS stays offline, something between the two is blocking API requests — a VPN, firewall, ad-blocker or security plugin. The browser's developer tools (Network tab) — or Advanced → Toggle Developer Tools in the desktop app — show which request fails.