Help configuring mec AS2

0:13:58 AM] mec_as2-1207646038281-19@partnerB_partnerA: Outgoing message signed with the algorithm SHA-1,using keystore alias "partnerb".
[Apr 8, 2008 10:13:58 AM] mec_as2-1207646038281-19@partnerB_partnerA: Outgoing message encrypted with the algorithm 3DES, using keystore alias "partnera".
[Apr 8, 2008 10:13:58 AM] mec_as2-1207646038281-19@partnerB_partnerA: Outbound AS2 message created from "testmsg" for the receiver "partnerA", raw message size: 2.00 KB
[Apr 8, 2008 10:13:58 AM] mec_as2-1207646038281-19@partnerB_partnerA: Sending message to http://localhost:18080/as2, sync MDN requested.
[Apr 8, 2008 10:13:58 AM] mec_as2-1207646038281-19@partnerB_partnerA: The server localhost failed to respond
[Apr 8, 2008 10:13:58 AM] mec_as2-1207646038281-19@partnerB_partnerA: Transaction state written to C:\Program Files\mec\as2\messages\partnerA\sent\testmsg_mec_as2-1207646038281-19@partnerB_partnerA.sent.state.
[Apr 8, 2008 10:13:58 AM] mec_as2-1207646038281-19@partnerB_partnerA: Connection problem, failed to transmit data.
[Apr 8, 2008 10:13:58 AM] mec_as2-1207646038281-19@partnerB_partnerA: Message payload stored to "C:\Program Files\mec\as2\messages\partnerA\error\AS2Message30399.as2".
[Apr 8, 2008 10:13:58 AM] mec_as2-1207646038281-19@partnerB_partnerA: Raw outgoing message stored to "C:\Program Files\mec\as2\messages\partnerA\error\raw\error30400.raw".
[Apr 8, 2008 10:14:09 AM] Keys and certificates loaded from "C:\Program Files\mec\as2\certificates.p12".

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Hi. I work for a small company which is in the process of developing a simple web application which will allow our customers to create relationships between partners, using AS2.
I would like to use mec AS2 as a sanity check to provce that what I have written conforms to the AS2 spec. I have managed to get openas2 talking to my simple process, but I cannot get mec AS2 to work.
I have a process listening on http://localhost:/ for an as2 message, so I have configured a remote partner in mec AS2 called partnerA whose receipt URL is the same url as above.
I believe that I am using the correct alias/cert etc, but when I attempt to send a message I get:
"Sending message to http://localhost:18080/as2, async..."
"The server localhost failed to respond"
I get no response in my process, so it seems that the message doesn't even reach my process.
I can even enter that URL into a browser and my application will throw an exception, so it is listening on the correct port/url, it just seems that mec as2 is not sending this correctly?
Any ideas?
-Matt