You know me, I don't like to complain

So we recently upgraded hardware at hellyeah.com to a new Xserve, which has been a vast improvement performance-wise.

But mail, dns, and IM falls under my area of expertise but I’m not able to reach my gmail XMPP/jabber contacts anymore.  We have server-to-server federation working to a few other sites without problem or incident (heya jabber.org, IETF, ecotroph et al) but for some reason gmail.com contacts are incommunicado.  

I’ve tried to delete and re-add contacts to request authentication, but they don’t seem to get it (surely they’re not all giving me the finger on purpose!)

We get messages in /var/log/system.log (`messages`):

Aug 11 13:39:28 autobahn jabberd/resolver¹⁸⁰⁷⁶: [gmail.com] resolved to [209.85.171.83:5269] (60 seconds to live)
Aug 11 13:39:28 autobahn jabberd/resolver¹⁸⁰⁷⁶: [gmail.com] resolved to [64.233.161.83:5269] (60 seconds to live)
Aug 11 13:39:28 autobahn jabberd/resolver¹⁸⁰⁷⁶: [gmail.com] resolved to [64.233.171.83:5269] (60 seconds to live)

I’ve been trying to reach someone on the Gmail Federation team but haven’t had much luck.  I’m getting lookups to gmail XMPP servers but they’re just not accepting the conversation.  Any ideas?