# SmbMountOptions
Specifies the version of the Server Message Block (SMB) protocol that AWS DataSync uses to access an SMB file server.
## Contents
** Version **
By default, DataSync automatically chooses an SMB protocol version based on negotiation with your SMB file server. You also can configure DataSync to use a specific SMB version, but we recommend doing this only if DataSync has trouble negotiating with the SMB file server automatically.
These are the following options for configuring the SMB version:
+ `AUTOMATIC` (default): DataSync and the SMB file server negotiate the highest version of SMB that they mutually support between 2.1 and 3.1.1.
This is the recommended option. If you instead choose a specific version that your file server doesn't support, you may get an `Operation Not Supported` error.
+ `SMB3`: Restricts the protocol negotiation to only SMB version 3.0.2.
+ `SMB2`: Restricts the protocol negotiation to only SMB version 2.1.
+ `SMB2_0`: Restricts the protocol negotiation to only SMB version 2.0.
+ `SMB1`: Restricts the protocol negotiation to only SMB version 1.0.
**Note**
The `SMB1` option isn't available when [creating an Amazon FSx for NetApp ONTAP location](https://docs.aws.amazon.com/datasync/latest/userguide/API_CreateLocationFsxOntap.html).
Type: String
Valid Values: `AUTOMATIC | SMB2 | SMB3 | SMB1 | SMB2_0`
Required: No
## See Also
For more information about using this API in one of the language-specific AWS SDKs, see the following:
+ [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/datasync-2018-11-09/SmbMountOptions)
+ [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/datasync-2018-11-09/SmbMountOptions)
+ [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/datasync-2018-11-09/SmbMountOptions)