Subscribing to an LJ Talk roster from another server

[Michael Rogers]

I'm not sure if this is a djabberd issue or a livejournal-specific 
issue, so I apologise if this is the wrong list.

I've been having trouble subscribing to a livejournal account's presence 
from a non-livejournal account or vice versa, although it's possible for 
two livejournal accounts or two non-livejournal accounts to subscribe to 
each other's presences (I've tested every combination of 
livejournal.com, jabber.org and gmail.com).

As far as I understand it the message flow should look like this:

A -> B: subscribe  (A asks to subscribe to B's presence)
A <- B: subscribed (B allows the request)
A <- B: subscribe  (B asks to subscribe to A's presence)
A -> B: subscrubed (A allows the request)

With two livejournal accounts or two non-livejournal accounts that's 
exactly what I see, and the accounts can subsequently chat with each 
other. But with one livejournal account and one non-livejournal account, 
the 'subscribe' and 'subscribed' messages are leaving the livejournal 
client but never reaching the non-livejournal client.

I see the same behaviour regardless of whether the clients use Pidgin or 
the Smack library, and all combinations of non-livejournal accounts are 
working, so I think it's a livejournal server issue - is djabberd 
blocking outgoing subscribe/subscribed messages for some reason?

Thanks,
Michael