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# VZNetworkBlockDeviceStorageDeviceAttachmentDelegate

Methods you implement to respond to changes to a network block device attachment.

```
protocol VZNetworkBlockDeviceStorageDeviceAttachmentDelegate : NSObjectProtocol
```

## Topics

### Responding to connectivity changes

[`attachment(_:didEncounterError:)`](/documentation/Virtualization/VZNetworkBlockDeviceStorageDeviceAttachmentDelegate/attachment(_:didEncounterError:))

The method the attachment object calls when the NBD client encounters a nonrecoverable error.

[`attachmentWasConnected(_:)`](/documentation/Virtualization/VZNetworkBlockDeviceStorageDeviceAttachmentDelegate/attachmentWasConnected(_:))

The method the attachment object calls when the NBD client successfully connects or reconnects with the server.


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