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Trezor Suite deals with two distinct types of connection: the physical link between your device and your computer over USB, and the network link between Trezor Suite and the blockchain backends that provide your balance and transaction history. Problems with either one can make it look like something is broken — but the fixes are different. This guide helps you identify which type you’re dealing with and resolve it quickly.

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Trezor Suite Shows “Disconnected”

A “Disconnected” status in Trezor Suite means the application can no longer see your physical device. Work through this checklist:
  • Check the USB cable. Ensure it is fully seated at both ends. Try the official Trezor cable if you have access to it, as charge-only cables won’t carry data.
  • Wake the device. If your Trezor has gone into sleep mode, the screen may be blank. Press the button on the device to wake it and re-establish the connection.
  • Reopen Trezor Suite. Fully quit the application and relaunch it — don’t just minimize or close the window.
  • Re-plug the device. Unplug your Trezor, wait five seconds, and plug it back in. Then check Trezor Suite for the connection prompt.
If these steps don’t help, see the Device Not Recognized guide for deeper USB troubleshooting by operating system.

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Balances Not Loading / Stuck Syncing

If your device is connected but balances are missing, stuck at zero, or the sync spinner never stops, the issue is likely with Trezor Suite’s connection to blockchain backends — not your device itself. Trezor Suite uses Blockbook servers (maintained by SatoshiLabs) to query the blockchain and retrieve your account history. If those servers are temporarily unreachable, or if your internet connection is interrupted, syncing will stall. To resolve this:
  1. Check your internet connection. Open a browser and confirm you can load a website. If not, resolve the network issue first.
  2. Open Trezor Suite Settings. Click the gear icon in the bottom-left corner.
  3. Navigate to Settings → Backend.
  4. Switch to a different backend. Select an alternative server from the list, or toggle between the default options. This forces a fresh sync attempt.
  5. Wait for resync. Depending on your account history, a full resync may take a minute or two.
Trezor Suite requires an active internet connection to display up-to-date balances and broadcast transactions. Without connectivity, you can still view previously cached data — your last known balance and transaction history will remain visible, but no new information will load.

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Custom Backend / Blockbook

If you run your own full node, you can connect Trezor Suite directly to it instead of relying on SatoshiLabs’ servers. This gives you greater privacy by ensuring your transaction queries never leave your own infrastructure. To connect a custom Blockbook backend:
  1. Go to Settings → Coins, then select the coin you want to configure.
  2. Enter the URL of your Blockbook instance (e.g., https://your-node.example.com) in the Custom Blockbook URL field.
  3. Save and wait for Trezor Suite to establish the connection.
This is an advanced option intended for users who have already set up and confirmed their node is running correctly.

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Tor Connection Issues

Trezor Suite includes built-in Tor support, which routes your traffic through the Tor network to improve privacy. However, Tor connections are inherently slower and occasionally unreliable, which can cause sync delays or timeouts that look like connection failures. If you have Tor enabled and Trezor Suite is loading slowly or not syncing:
  1. Open Settings → Privacy.
  2. Locate the Tor toggle and disable it temporarily.
  3. Recheck whether syncing resumes at normal speed.
You can re-enable Tor at any time. If disabling Tor resolves the sync issue, the problem is with Tor network latency or exit node availability — try again later or consider using a different Tor configuration.
If sync problems persist across multiple sessions, try reinstalling Trezor Suite. Your wallet data is stored on the device and on the blockchain — nothing important lives inside the application itself. A clean reinstall often resolves deep-seated sync and connection issues without any risk to your funds.