WSO2 ESB message processor fails sending messages to rabbitMQ endpoint - wso2

Question

In WSO2 ESB 4.9.0 I configured a Scheduled Message Forwarding Processor to forward messages to a rabbitMQ message queue.
If I configure the targetEndpoint parameter in the message processor pointing to a proxy or API within the ESB, and then I send it to the rabbitMQ message queue, it works and no errors.
However, I would like the targetEndpoint to simply point directly to the external rabbitMQ message queue, with no proxy or API workaround.
For this, I create an endpoint whose address url is basically this (no properties nor parameters):
rabbitmq:/AMQPProxy?rabbitmq.confirm.delivery=true&rabbitmq.connection.pool.size=10&rabbitmq.server.host.name=localhost&rabbitmq.server.port=5672&rabbitmq.server.user.name=guest&rabbitmq.server.password=guest&rabbitmq.queue.name=MyQueue&rabbitmq.queue.routing.key=MyQueue
Then I point the targetEndpoint parameter in the message processor to this endpoint, and I get the following error.
[2017-05-08 16:49:12,298] ERROR - ForwardingService BlockingMessageSender of message processor [rabbitmq-message-processor] failed to send message to the endpoint
[2017-05-08 16:49:17,299] ERROR - ClientUtils The system cannot infer the transport information from the rabbitmq:/AMQPProxy?rabbitmq.confirm.delivery=true&rabbitmq.connection.pool.size=10&rabbitmq.server.host.name=localhost&rabbitmq.server.port=5672&rabbitmq.server.user.name=guest&rabbitmq.server.password=guest&rabbitmq.queue.name=MyQueue&rabbitmq.queue.routing.key=MyQueue URL.
[2017-05-08 16:49:17,299] ERROR - BlockingMsgSender Error sending Message to url : rabbitmq:/AMQPProxy?rabbitmq.confirm.delivery=true&rabbitmq.connection.pool.size=10&rabbitmq.server.host.name=localhost&rabbitmq.server.port=5672&rabbitmq.server.user.name=guest&rabbitmq.server.password=guest&rabbitmq.queue.name=MyQueue&rabbitmq.queue.routing.key=MyQueue
org.apache.axis2.AxisFault: The system cannot infer the transport information from the rabbitmq:/AMQPProxy?rabbitmq.confirm.delivery=true&rabbitmq.connection.pool.size=10&rabbitmq.server.host.name=localhost&rabbitmq.server.port=5672&rabbitmq.server.user.name=guest&rabbitmq.server.password=guest&rabbitmq.queue.name=MyQueue&rabbitmq.queue.routing.key=MyQueue URL.
at org.apache.axis2.description.ClientUtils.inferOutTransport(ClientUtils.java:81)
at org.apache.axis2.client.OperationClient.prepareMessageContext(OperationClient.java:288)
at org.apache.axis2.description.OutOnlyAxisOperationClient.executeImpl(OutOnlyAxisOperation.java:249)
at org.apache.axis2.client.OperationClient.execute(OperationClient.java:149)
at org.apache.synapse.message.senders.blocking.BlockingMsgSender.sendRobust(BlockingMsgSender.java:265)
at org.apache.synapse.message.senders.blocking.BlockingMsgSender.send(BlockingMsgSender.java:183)
at org.apache.synapse.message.processor.impl.forwarder.ForwardingService.dispatch(ForwardingService.java:465)
at org.apache.synapse.message.processor.impl.forwarder.ForwardingService.execute(ForwardingService.java:208)
at org.wso2.carbon.mediation.ntask.NTaskAdapter.execute(NTaskAdapter.java:90)
at org.wso2.carbon.ntask.core.impl.TaskQuartzJobAdapter.execute(TaskQuartzJobAdapter.java:67)
at org.quartz.core.JobRunShell.run(JobRunShell.java:213)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
[2017-05-08 16:49:17,301] ERROR - ForwardingService BlockingMessageSender of message processor [rabbitmq-message-processor] failed to send message to the endpoint
Could you tell me if it is possible to solve it and how?