var accessKey = Config.GetValue("AWSAccessKey");
var secretKey = Config.GetValue("AWSSecretKey");
using (var client = new AmazonS3Client(accessKey, secretKey, config))
{
            var request = new PutObjectRequest();
            request.BucketName = Config.GetValue("PublicBucket");
            request.Key = newFileName;
            request.InputStream = resizedImage;
            request.AutoCloseStream = false;
            using (var uploadTaskResult = client.PutObject(request))
            {
                using (var uploadStream = uploadTaskResult.ResponseStream)
                {
                    uploadStream.Seek(0, SeekOrigin.Begin);
                    var resultStr = new StreamReader(uploadStream).ReadToEnd();
                }
            }
}

Fatal unhandled exception in Web API component: System.Net.WebException: The remote name could not be resolved: 'images.ourcompany.com.http'
   at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)
   at System.Net.HttpWebRequest.GetRequestStream()
   at Amazon.S3.AmazonS3Client.getRequestStreamCallback[T](IAsyncResult result)
   at Amazon.S3.AmazonS3Client.endOperation[T](IAsyncResult result)
   at Amazon.S3.AmazonS3Client.EndPutObject(IAsyncResult asyncResult)
   at Tracks.Application.Services.Bp.BpTemplateService.UploadImage(Byte[] image, String fileName) in ...