In lib/mongoid/config.rb

<pre>
def reconnect!(now = true)
if now
master.connection.connect
else

1. We set a @reconnect flag so that #master knows to reconnect the next
2. time the connection is accessed.
   @reconnect = true
   end
   end
   </pre>

In the recent releases mongoid already added support for multi-database connections. reconnect! should also reconnect other connections but now it only reconnect the Mongoid.master connection.