Here’s a quick guide on how to get crossdomain access working for SOAP Webservices from Flash and Flex. Obviously you need to allow access to the domain, however it’s more difficult to realise that you also need to allow the SOAP headers to be sent to the foreign server.

Here is an example crossdomain file that does just that – amend to suit your own requirements, the * wildcard is probably not what you need for your production server.

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