Can't login when one node in cluster crash

Hi all,
i deploy clustering openfire with haproxy. When a node dead user can’t login until restart all node.
Why? how to fix it.

What versions are involved here, are there any openfire logs when the log in attempts are made?

Hi, I use version 4.1.6 . the failover work correctly when i stop service openfire. but a node is overload cpu or ram(can’t ping) other node is die until i restart service openfire.