BlazeDS is your best bet. Try this tutorial, http://www.flexlive.net/?p=92

most servers have the ability to restrict access by domain.just google for "<your server name> restrict access bydomain"

opening a file from a db is a two step process,1. use server side code to grab the file from the db andplace it a temp web folder. return the url of the new file back tothe flex client2. call navigateToURL() from flex to open the new file in anew browser window

the LCDS sql assembler might be a good fit for you. it allowsyou to do sql crud from flex. there's not server side coding, justxml config. http://livedocs.adobe.com/livecycle/8.2/programLC/programmer/lcds/help.html?content=dms_standard_assemblers_2.html#334899

Can you post your x-domain file here? also, can you use ahttp proxy, such as the charles debug proxy, to see if the x-domainfile is indeed fetched. it could be just a permission issue withthe file.

blazeds should be on the high end of the performance scale,compare to WS or REST. To test for low bandwidth environments, usecharles debug proxy to throttle the traffic.

you might find this article useful, http://www.adobe.com/devnet/flex/articles/flex_ws.htmlnote, flex only supports up to soap 1.1. i'm not an .netexpert, but i believe it uses a higher version of soap by default.i would recommend you looking into weborb for .net instead.

try the following these steps,1. on the server side, return the blob data as byte[]. thatwill be serialized into a ByteArray object in AS32. use flash.Display.Loader as the container for the image.load the ByteArray using Loader.loadBytes(...)3. add the Loader object to the display

can you post the code of how you serialized between java andas3?

this is really a Flex/AIR performance problem, not related todata services. considering AS3 does not support multi-threading, and notlikely to support it in the next version, I suggest you transferthe files using multipart post instead of ws.