# Reconnection strategy

## Overview

See [Reconnection strategy](/paas/sdk/unified-vpn-sdk/features/reconnection-strategy.md)

## Enabling Automatic Reconnection

Automatic reconnection is enabled by default. To explicitly enable it (for example, after previously disabling it), you can use the following method:

```kotlin
import unified.vpn.sdk.*

UnifiedSdk.setReconnectionEnabled(true)
```

By calling `setReconnectionEnabled(true)`, the SDK will resume handling network switches and transport errors automatically.

## Disabling Automatic Reconnection

To disable the automatic reconnection behavior, you can use the following method:

```kotlin
import unified.vpn.sdk.*

UnifiedSdk.setReconnectionEnabled(false)
```

By calling `setReconnectionEnabled(false)`, the SDK will not attempt to reconnect automatically when network switches occur or transport errors happen. You will need to handle reconnection manually in your application logic.

## Default Reconnection Behavior

By default, the SDK will automatically handle network reconnection when the user switches between networks. The SDK's behavior in different scenarios is as follows:

### VPN ON and Network Connection Disabled

* If VPN is ON and the user disables the network connection, the SDK transfers to the PAUSED state.
* After the network connection is re-enabled, the SDK automatically connects to the last successful configuration.

### Transport Error During Connection

* If a transport error occurs during connection, the SDK will attempt to reconnect automatically.
* However, there are certain exceptions where automatic reconnection will not occur:

| Error Code             | Description                                                                                     |
| ---------------------- | ----------------------------------------------------------------------------------------------- |
| `CODE_NOT_AUTHORIZED`  | The user is not authorized. In this case, you need to call `HydraSdk.login` to re-authenticate. |
| `CODE_SESSIONS_EXCEED` | The session limit is reached in accordance with the Terms of Service (ToS).                     |
| `CODE_DEVICES_EXCEED`  | The devices limit is reached in accordance with the ToS.                                        |
| `CODE_OAUTH_ERROR`     | An authentication error occurred on the OAuth server.                                           |
| `CODE_TRAFFIC_EXCEED`  | The traffic limit is exceeded in accordance with the ToS.                                       |
| `USER_SUSPENDED`       | The user account is suspended.                                                                  |


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