Develop Reference

Amazon ECS API spontaneous "(400) Bad Request" errors for ItemSearch()

Starting at about 11 PM CST on 5/29/2017, I began receiving "(400) Bad Request" errors for all my ItemSearch() calls. I am using the C# API and have been doing so successfully for well over a year now with no problems. No code or configuration has changed on my end, and I have been able to reproduce the error both in production and development. My security credentials appear to still be valid according to the IAM Management Console, and I haven't received any communications from Amazon that would indicate that my account has been deactivated or anything of that nature.
This is what is returned for all of my calls:
System.ServiceModel.ProtocolException: The remote server returned an unexpected response: (400) Bad Request. ---> System.Net.WebException: The remote server returned an error: (400) Bad Request.
at System.Net.HttpWebRequest.GetResponse()
at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
--- End of inner exception stack trace ---
Server stack trace:
at System.ServiceModel.Channels.HttpChannelUtilities.ValidateRequestReplyResponse(HttpWebRequest request, HttpWebResponse response, HttpChannelFactory`1 factory, WebException responseException, ChannelBinding channelBinding)
at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at MyCode.com.amazonaws.ecs.AWSECommerceServicePortType.ItemSearch(ItemSearchRequest1 request)
Is anyone else experiencing this?
I did check this very old thread, but I don't believe it's relevant given how this sprung up out of nowhere and has been working perfectly for so long.

None of the specified endpoints were reachable

There is intermittent issue in rabbitmq while publishing message from .net application. It is creating lots of noise in the system.
I have tried googling but could not found root cause of an issue.
Here is the error I can see in application log,
None of the specified endpoints were reachable
Endpoints attempted:
------------------------------------------------
endpoint=amqp-0-9://localhost:5672, attempts=1
System.TimeoutException: Connection to amqp-0-9://localhost:5672 timed out
at RabbitMQ.Client.Impl.SocketFrameHandler_0_9.Connect(TcpClient socket, AmqpTcpEndpoint endpoint, Int32 timeout)
at RabbitMQ.Client.Impl.SocketFrameHandler_0_9..ctor(AmqpTcpEndpoint endpoint, ObtainSocket socketFactory, Int32 timeout)
at RabbitMQ.Client.Framing.Impl.v0_9_1.ProtocolBase.CreateFrameHandler(AmqpTcpEndpoint endpoint, ObtainSocket socketFactory, Int32 timeout)
at RabbitMQ.Client.ConnectionFactory.FollowRedirectChain(Int32 maxRedirects, IDictionary`2 connectionAttempts, IDictionary`2 connectionErrors, AmqpTcpEndpoint[]& mostRecentKnownHosts, AmqpTcpEndpoint endpoint)
================================================
Stack trace:
at RabbitMQ.Client.ConnectionFactory.CreateConnection(Int32 maxRedirects)
at RabbitMQ.Client.ConnectionFactory.CreateConnection()

I have resolved this issue by making RabbitMQ Connection object singleton to make sure reuse connection instead of making new connection everytime.

WCF Service TargetInvocationException - Possible Cyclic Reference

I need a little help with an Exception being thrown at my WCF service. The point is: I need to develop a WPF application and I've heard that to treat data WCF is the best choice so I used it only with basic knowledge and now I have this problem.
The point is, I have a Customer class, a Supplier class and an Order class. I have then two services: the first one has all methods to add, read and edit customers and suppliers from database. This service works perfectly fine. The second service has methods to add new orders, edit orders and read them from database, and this service has a problem.
The class Customer has a list of Suppliers (the suppliers from which the customer buys), the class Supplier has a list of Customers (the customers that buy from that supplier). The class order has a Customer, a Supplier and a list of Itens (and the itens are added to the database together with the order).
The method for adding an order works fine, however, once an order has been added, the method to list the orders throws the TargetInvocationException. I searched a lot on the internet and the best answer I've found is that it's possibly a "Ciclyc Reference".
The method to list the orders is inside the repository class and is simply:
public IQueryable<Order> ListOrders()
{
return Context.Set<Order>().Include(x => x.Customer).Include(x => x.Supplier);
}
Where Context is the entity framework context. I tried to remove the includes and load the customer and supplier separately, but the result was the same exception.
Can someone please help me ? If I need to post more information just tell me. And sorry if this matter is trivial, I'm new to WPF and WCF so I'm still a little confused.
Thanks a lot in advance.
EDIT Exception below
An error occurred while receiving the HTTP response to
http://SomeService.com/OrdersService.svc. This could be due to the
service endpoint binding not using the HTTP protocol. This could also
be due to an HTTP request context being
aborted by the server (possibly due to the service shutting down). See
server logs for more details.
Server stack trace: at
System.ServiceModel.Channels.HttpChannelUtilities.ProcessGetResponseWebException(WebException
webException, HttpWebRequest request, HttpAbortReason abortReason)
at
System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan
timeout) at
System.ServiceModel.Channels.RequestChannel.Request(Message message,
TimeSpan timeout) at
System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message
message, TimeSpan timeout) at
System.ServiceModel.Channels.ServiceChannel.Call(String action,
Boolean oneway, ProxyOperationRuntime operation, Object[] ins,
Object[] outs, TimeSpan timeout) at
System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage
methodCall, ProxyOperationRuntime operation) at
System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage
message)
Exception rethrown at [0]: at
System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage
reqMsg, IMessage retMsg) at
System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData&
msgData, Int32 type) at IOrdersService.ReturnOrders() at
OrdersServiceClient.ReturnOrders()
Inner Exception: The underlying connection was closed: An unexpected
error occurred on a receive. at
System.Net.HttpWebRequest.GetResponse() at
System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan
timeout)
Inner Exception: Unable to read data from the transport connection: An
existing connection was forcibly closed by the remote host. at
System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset,
Int32 size) at System.Net.PooledStream.Read(Byte[] buffer, Int32
offset, Int32 size) at
System.Net.Connection.SyncRead(HttpWebRequest request, Boolean
userRetrievedStream, Boolean probeRead)
Inner Exception: An existing connection was forcibly closed by the
remote host at System.Net.Sockets.Socket.Receive(Byte[] buffer,
Int32 offset, Int32 size, SocketFlags socketFlags) at
System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset,
Int32 size)

Mark your data objects with the [DataContract(IsReference = true)] attribute. This should resolve the issue.

Sharepoint 2010 problems with WCF service

I need to create wcf service for sharepoint 2010. The idea to use Jquery ajax to communicate with this service. But all cals to service methods always fail.
The
I try to use WCF Test Client and get message:
Failed to invoke the service. Possible causes: The service is offline or inaccessible; the client-side configuration does not match the proxy; the existing proxy is invalid. Refer to the stack trace for more detail. You can try to recover by starting a new proxy, restoring to default configuration, or refreshing the service.
and error detais:
The content type text/html; charset=utf-8 of the response message does not match the content type of the binding (text/xml; charset=utf-8). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly. The first 227 bytes of the response were: 'A transport-level error has occurred when sending the request to the server. (provider: Shared Memory Provider, error: 0 - Either a required impersonation level was not provided, or the provided impersonation level is invalid.)'.
Server stack trace:
at System.ServiceModel.Channels.HttpChannelUtilities.ValidateRequestReplyResponse(HttpWebRequest request, HttpWebResponse response, HttpChannelFactory factory, WebException responseException, ChannelBinding channelBinding)
at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at ITV2WCFService.DoWork()
at TV2WCFServiceClient.DoWork()
But service http://localhost/_vti_bin/site/TEMPSERVICE.svc/mex is avaliable and give me normal response.
Everything done according to article on msdn
http://msdn.microsoft.com/en-us/library/ff521581.aspx
Whats the problem and how to deal with it?

Evgeny:
It looks like your webservice returns standard SOAP XML response. JQuery expects to use JSON. I think the easier way is to set JQuery to use XML. Alternatively you can change your web service to return JSON instead of XML.

Solution: Anonymous access have to be enabled!

TimoutException occurs over a network but not locally

I have a program with three WCF services and when I run them locally (i.e: Server and Clients are all on localhost) everything works. However when I test them across a network I get a TimoutException on two services but not the other. I've disabled the firewalls on all the machines involved in the test. I can both ping the server and access the wsdl "You have created a service" webpage from the client
The service that works uses a BasicHttpBinding with streaming and the two which don't work use WSDualHttpBinding. The Services that use WSDualHttpBinding both have CallbackContracts. I apologise for the vagueness of this question but I'm not really sure what code to include or where to even start looking for the solution to this.
Non-working bindings:
public static Binding CreateHTTPBinding()
{
var binding = new WSDualHttpBinding();
binding.MessageEncoding = WSMessageEncoding.Mtom;
binding.MaxBufferPoolSize = 2147483647;
binding.MaxReceivedMessageSize = 2147483647;
binding.Security.Mode = WSDualHttpSecurityMode.None;
return binding;
}
Exception Stack Trace:
Unhandled Exception: System.TimeoutException: The open operation did not complete within the allotted timeout of 00:01:00. The time allotted to this operation may have been a portion of a longer timeout.
Server stack trace:
at System.ServiceModel.Channels.ReliableRequestor.ThrowTimeoutException()
at System.ServiceModel.Channels.ReliableRequestor.Request(TimeSpan timeout)
at System.ServiceModel.Channels.ClientReliableSession.Open(TimeSpan timeout)
at System.ServiceModel.Channels.ClientReliableDuplexSessionChannel.OnOpen(TimeSpan timeout)
at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.OnOpen(TimeSpan timeout)
at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.CallOpenOnce.System.ServiceModel.Channels.ServiceChannel.ICallOnce.Call(ServiceChannel channel, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.CallOnceManager.CallOnce(TimeSpan timeout, CallOnceManager cascade)
at System.ServiceModel.Channels.ServiceChannel.EnsureOpened(TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at IDemeService.Register()
at DemeServiceClient.Register()
at DemeClient.Client.Start()
at DemeClient.Program.Main(String[] args)

You may enable System.Net tracing on both sides and read about the Timeout exception.
http://support.microsoft.com/kb/947285

You are using a DualHttpBinding. What this means is that you are setting up a duplex channel, where server can send messages (not response message, but a incoming message) to client. But you haven't setup a clientBaseAddress where client will be listening for incoming messages from server. This is what is causing this issue. from http://msdn.microsoft.com/en-us/library/system.servicemodel.wsdualhttpbinding.aspx:
This binding requires that the client has a public URI that provides a callback endpoint for the service. This is provided by the ClientBaseAddress. A dual binding exposes the IP address of the client to the service. The client should use security to ensure that it only connects to services it trusts.