Re:wrong (Score 3, Interesting)

either you don't understand how jabberd linking works, or I don't understand what you're trying to do. You can link different jabberd servers in any way you want. If you want a HA, failsafe system, put your jabberd's on different switched subnets in a hypercube pattern, and you can lose several servers or subnets without affecting the network as a whole.

You mainly seem to be concerned that since there in a single access point to the system, the whole thing can fail with a single attack on the main server. To a certain extent that's true. The user login data is kept on a jabber server, somewhere, and if that machine fails you lose the ability for certain users to login. I'm not sure if you can replicate user data across several jabberd's (with proper delegation and syncing), but it's probably not hard to implement.