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copied!<p>I found the issue, at last.</p> <p>When targeting buckets in a specific region, the Amazon S3 client object will have to be configured to use a specific endpoint. The code to configure the endpoint is as in the constructor and creation of the client is in the individual methods of the class below:</p> <pre><code>public class AmazonS3Service : IAmazonS3Service { private AmazonS3 client; private string accessKeyID; private string secretAccessKeyID; private AmazonS3Config config; public AmazonS3Service() { accessKeyID = ConfigurationManager.AppSettings["AWSAccessKey"]; secretAccessKeyID = ConfigurationManager.AppSettings["AWSSecretKey"]; config = new AmazonS3Config(); config.ServiceURL = ConfigurationManager.AppSettings["AWSEUEndPoint"]; } public void CreateBucket(string bucketName) { using (client = Amazon.AWSClientFactory.CreateAmazonS3Client(accessKeyID, secretAccessKeyID, config)) { try { PutBucketRequest request = new PutBucketRequest(); request.WithBucketName(bucketName) .WithBucketRegion(S3Region.EU); client.PutBucket(request); } catch (AmazonS3Exception amazonS3Exception) { if (amazonS3Exception.ErrorCode != null && (amazonS3Exception.ErrorCode.Equals("InvalidAccessKeyId") || amazonS3Exception.ErrorCode.Equals("InvalidSecurity"))) { //log exception - ("Please check the provided AWS Credentials."); } else { //log exception - ("An Error, number {0}, occurred when creating a bucket with the message '{1}", amazonS3Exception.ErrorCode, amazonS3Exception.Message); } } } } public void UploadFile(string bucketName, Stream uploadFileStream, string remoteFileName) { using (client = Amazon.AWSClientFactory.CreateAmazonS3Client(accessKeyID, secretAccessKeyID, config)) { try { PutObjectRequest request = new PutObjectRequest(); request.WithBucketName(bucketName) .WithCannedACL(S3CannedACL.PublicRead) .WithKey(remoteFileName) .WithInputStream(uploadFileStream); using (S3Response response = client.PutObject(request)) { WebHeaderCollection headers = response.Headers; foreach (string key in headers.Keys) { //log headers ("Response Header: {0}, Value: {1}", key, headers.Get(key)); } } } catch (AmazonS3Exception amazonS3Exception) { if (amazonS3Exception.ErrorCode != null && (amazonS3Exception.ErrorCode.Equals("InvalidAccessKeyId") || amazonS3Exception.ErrorCode.Equals("InvalidSecurity"))) { //log exception - ("Please check the provided AWS Credentials."); } else { //log exception -("An error occurred with the message '{0}' when writing an object", amazonS3Exception.Message); } } } } } </code></pre> <p>The various endpoints of each of Amazon's services can be found at at this URL - <a href="http://docs.amazonwebservices.com/general/latest/gr/index.html?rande.html" rel="noreferrer">http://docs.amazonwebservices.com/general/latest/gr/index.html?rande.html</a></p> <p>Hope this helps someone!</p>

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