I had a project in production for several months when
sysadmin decided to move apache to separate server than MySQL. Of
course, I wasn't consulted until after things quit working. Changed
paths in php files that serve data to swf and it didn't work. Got
the crossdomain error. Verified that php files were pulling data
out of tables, but swf could not display. Made all the suggested
changes to crossdomain.xml file; no help. Then I found that flex
project worked correctly when I used Firefox, but generated an
error when I used IE6. I believe that this issue has to do at least
in part with some problem IE6 has with SSL. The way I eventually
solved my problem was by moving swfs back to the same server that
serves MySQL. Now application works with IE6 and Firefox.
Hope this helps someone.
Andy C.(never #)