Stuck on getting iPhone secure channel to work

Question

I have created a simple 'hello world' flex mobile project to go on an iphone.  There is also a server created using grails and I am using Blazeds to communicate between the two.  I wanted the communication between them to be secure, so I wanted to use a secure channel.  So I have the following channel definition:
<channel-definition id='my-secure-amf' class='mx.messaging.channels.SecureAMFChannel'>
     <endpoint url='https://{server.name}:{server.port}/{context.root}/messagebroker/amfsecure'
          class='flex.messaging.endpoints.SecureAMFEndpoint'/>
     <properties>
          <add-no-cache-headers>false</add-no-cache-headers>
     <properties>
</channel-definition>
and an equivalent CallResponder and service created via the Flash Builder Data/Services wizard.  When I run the flex project on the iphone simulator on the desktop everything works fine, but when I package it into an app and run it on my iphone i get the following error message:
Send failed
Channel.Connect.Failed error
NetConnection.Call.Failed: HTTP:
Failed: url: 'https://www.example.com/messagebroker/amfsecure'
(I have changed the website address, but it does work on the simulator and I also have an ordinary flex project which runs fine against the website address.)
Please can anybody help, as I have run out of ideas.
Thanks in advance.

Answer 1

Also tryed out the tips from https://discussions.apple.com/message/6982187#6982187
But no succes