Acrobat has different crossdomain restrictions. Try a crossdomain file that looks like to test the connection:
<!DOCTYPE cross-domain-policy SYSTEM "/xml/dtds/cross-domain-policy.dtd">
<allow-access-from domain="*" to-ports="*" />
<allow-http-request-headers-from domain="*" headers="*"/>
Following there are a couple of good articles dealing with web services calls:
It worked with the cross domain file that you provided.