Push notification pushes only doom

I'm trying to get push notification working correctly on my server. I seem to have hit a snag. Facts: -DNS for the server is correct (verified with changeip -checkhostname) -Forward and reverse lookups are correct for server -Pubsub DNS record is published and correct -xmpp-server and xmpp-client records are published and tested -Push Notification is enabled for the iCal server and Mail Server and correctly displays in server admin. I can see the com.apple.notificationuser connecting successfully to xmpp. -Firewall ports are open and correct -XMPP has a password in my keychain for the XMPP notification service -Network capture verifies that when I run the iCal client, it connects to port 5223 of the server. However, at the same time, the server logs this and push fails to work for that client: Jul 13 21:58:10 internal jabberd/c2s8883: 12 ::ffff:, port=32787 connect Jul 13 21:58:10 internal jabberd/c2s8883: ODKVerifyClientRequestFixed: Unable to authenticate Jul 13 21:58:10 internal jabberd/c2s8883: 12 ::ffff:, port=32787 disconnect jid=unbound, packets: 0 Note: was substituted for my IP address of the system that executed the iCal client. Likewise, Mail server logs a 404 error to XMPP every time I receive an email: Jul 13 21:57:03 internal push_notify15477: error: Clearly, something isn't right here, but I cannot unravel what it is. It seems jabberd/c2s is trying to perform some trick of authentication but it is not succeeding. Server is running 10.6.4. Has anyone gotten this to work successfully? Verified it with a network capture? Note that the ODKVerifyClientRequestFixed only logs when an iCal client connects and tries to set up a push session. BTW, I'm NOT trying to get this to work on iPhones or iPads. I know that does not work. I'm merely trying to get it working with the iCal and Mail clients on the Mac desktops.