fhickler,
If you are on a hosted Adobe Connect server - you will not be able to "import" or modify the existing crossdomain.xml file. It needs to be placed on the root of the Adobe Connect server and you won't have access to the file structure to do so. It would have to go through Adobe and due to their hosted nature - that [probably] won't happen.
You could import the XML into Adobe Connect and therefore keep on the same domain without issue.
Regards,
Andrew