I am using Fedora 14 and having LTSP 4.2 and K12Linux. I am using LTSP 4.2 for old computer which is not booting with K12Linux. on LTSP 4.2 i am using GDM Login manager and XFCE4 display manager. every thing is going fine except in a gap of 2 or 3 days all system which is connect to server working fine but when any one logout there is no login screen. and the user which are using GNome display manager became hang. and the user who using Xfce4 and connected to server working fine except if he will logout than there is no login screen. and if we want to login on Fedora machine using root we are not able to login if on client machine we are using su than no response.