Amazon PutObjectRequest for large files throws error

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Amazon-S3

I am getting an error while uploading large files more than 50 MB using

PUTObjectRequest**. It throws an error **unable to write data to the transport connection: An existing connection was forcibly closed by the remote host.

I am using federated user for this putobjectrequest.
Please help me out to solve this issue.

I am sending multiple files parallel using task as

Task.Factory.StartNew(()=>{

PutObjectRequest req=new PutObjectRequest()

{

bucketName=_bucketName,

key=fileKey,

FilePath=demoPath

};

PutObjectResponse resp= client.PurObjectRequest(req);

}

);