Flash Socket Policy - Policy is served, but client

I have a service set up on port 2400. When I run the Flash client from Flash itself, it runs fine because it bypasses security policy.

When I try to connect by running the SWF on my desktop, or from the browser, I see this exchange:

00000000  3c 70 6f 6c 69 63 79 2d  66 69 6c 65 2d 72 65 71 <policy- file-req
00000010  75 65 73 74 2f 3e 00                             uest/>.

00000000  3c 3f 78 6d 6c 20 76 65  72 73 69 6f 6e 3d 22 31 <?xml ve rsion="1
00000010  2e 30 22 3f 3e 3c 21 44  4f 43 54 59 50 45 20 63 .0"?><!D OCTYPE c
00000020  72 6f 73 73 2d 64 6f 6d  61 69 6e 2d 70 6f 6c 69 ross-dom ain-poli
00000030  63 79 20 53 59 53 54 45  4d 20 22 68 74 74 70 3a cy SYSTE M "http:
00000040  2f 2f 77 77 77 2e 61 64  6f 62 65 2e 63 6f 6d 2f //www.ad obe.com/
00000050  78 6d 6c 2f 64 74 64 73  2f 63 72 6f 73 73 2d 64 xml/dtds /cross-d
00000060  6f 6d 61 69 6e 2d 70 6f  6c 69 63 79 2e 64 74 64 omain-po licy.dtd
00000070  22 3e 20 3c 63 72 6f 73  73 2d 64 6f 6d 61 69 6e "> <cros s-domain
00000080  2d 70 6f 6c 69 63 79 3e  20 3c 73 69 74 65 2d 63 -policy>  <site-c
00000090  6f 6e 74 72 6f 6c 20 70  65 72 6d 69 74 74 65 64 ontrol p ermitted
000000A0  2d 63 72 6f 73 73 2d 64  6f 6d 61 69 6e 2d 70 6f -cross-d omain-po
000000B0  6c 69 63 69 65 73 3d 22  6d 61 73 74 65 72 2d 6f licies=" master-o
000000C0  6e 6c 79 22 2f 3e 20 3c  61 6c 6c 6f 77 2d 61 63 nly"/> < allow-ac
000000D0  63 65 73 73 2d 66 72 6f  6d 20 64 6f 6d 61 69 6e cess-fro m domain
000000E0  3d 22 2a 22 20 74 6f 2d  70 6f 72 74 73 3d 22 2a ="*" to- ports="*
000000F0  22 20 2f 3e 3c 2f 63 72  6f 73 73 2d 64 6f 6d 61 " /></cr oss-doma
00000100  69 6e 2d 70 6f 6c 69 63  79 3e 00                in-polic y>.

So you can see that I'm correctly including the null terminator in the response.

After the exchange of the policy request and policy file being served, the following happens:

Client sends SYN to server port 2400
Server responds SYN, ACK
Client sends ACK
Client sends FIN, ACK
Server responds ACK
Client sends RST, ACK

I'm assuming this is the client connecting (steps 1-3) then aborting (steps 4-6). Flash provides this error:

Error: Error #2048: Security sandbox violation: file:///C|/Projects/rbrnascar/trunk/Development/Websites/flash/SocialMap.swf cannot load data from robpaveza.net:2400.
    at com.redbull.model::SocialMapModel/onSecurityError()
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at flash.net::Socket/onTimeout()
    at flash.utils::Timer/_timerDispatch()
    at flash.utils::Timer/tick()

I've looked at the following pages, which seem to express similar troubles but no resolutions