I had same connection issue between SoapUI mock service and Flex.
Thanks you Ole.
I installed SoapUI 3.5 and I have changed settings for communication between those and working fine.
SoapUI is great tool and I have tested AMF Test, it’s great and thanks for this tool.
Roberto,
Please follow this settings, it will work.
1. Open the MockService Options dialog window and change the host into your box IP address instead of machine name.
Old Host: mehjk0006789
New Host: 10.3.179.80 (Set your IP address).
2. Create directory and point that directory in Docroot option
3. Click Ok.
4. Open Flex Application and edit web service tag like the following format.
wsdl="
http://10.3.101.80:8088/mockService_v1_0_SOAP11Binding?WSDL" result="CallSuccess(event);" fault="CallFault(event);">
resultFormat="object" fault="CallFault(event);">
5. Run Flex app, it will call the Mock Service and successfully returns your mocked response.
6. Enjoy

Thanks
Ragu Samuel