Players who die should update their minetest! This is client-side problem.
Issue was fixed today (6 Apr 2016): https://github.com/minetest/minetest/co ... 3cb2b97bef
Sfan5's build for Windows already available for download: viewtopic.php?f=42&t=1523&p=213268#p213268
Ubuntu daily minetest build should also contain the fix: https://code.launchpad.net/~minetestdev ... /+packages
Old message:
Warning for admins!
There is a high chance that minetest game builds newer than Sep 26, 2015 have "die on login" bug.
Bug happens on servers with damage "on" and bones "on", if server is lagging a lot - some people can lose their stuff dying at login (bones also disappear). It is client-side problem, not servers. Affected people should update to newest or use game older than 26 sep 2015.
Github issue: https://github.com/minetest/minetest/issues/3955