Hi Rune, I am getting a "No such host is known" while trying to upload a file to S3. Up until yesterday it was working fine, but since I get this error. The code runs fine from my local machines, but not from appharbor.
I tried upgrading libraries, but its not that.

System.Net.Http.HttpRequestException: No such host is known.
---> System.Net.Sockets.SocketException (11001): No such host is known. at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken) --- End of inner exception stack trace --- at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken) at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken) at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken) at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken) at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken) at System.Net.Http.HttpClient.FinishSendAsyncUnbuffered(Task1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts) at Amazon.Runtime.HttpWebRequestMessage.GetResponseAsync(CancellationToken cancellationToken) at Amazon.Runtime.Internal.HttpHandler1.InvokeAsyncT at Amazon.Runtime.Internal.RedirectHandler.InvokeAsyncT at Amazon.Runtime.Internal.Unmarshaller.InvokeAsyncT at Amazon.S3.Internal.AmazonS3ResponseHandler.InvokeAsyncT at Amazon.Runtime.Internal.ErrorHandler.InvokeAsyncT at Amazon.Runtime.Internal.ErrorHandler.InvokeAsyncT at Amazon.Runtime.Internal.CallbackHandler.InvokeAsyncT at Amazon.Runtime.Internal.EndpointDiscoveryHandler.InvokeAsyncT at Amazon.Runtime.Internal.EndpointDiscoveryHandler.InvokeAsyncT at Amazon.Runtime.Internal.CredentialsRetriever.InvokeAsyncT at Amazon.Runtime.Internal.RetryHandler.InvokeAsyncT at Amazon.Runtime.Internal.RetryHandler.InvokeAsyncT at Amazon.Runtime.Internal.CallbackHandler.InvokeAsyncT at Amazon.Runtime.Internal.CallbackHandler.InvokeAsyncT at Amazon.S3.Internal.AmazonS3ExceptionHandler.InvokeAsyncT at Amazon.Runtime.Internal.ErrorCallbackHandler.InvokeAsyncT at Amazon.Runtime.Internal.MetricsHandler.InvokeAsyncT