Snow Leopard machine will not allow anyone log in until reboot

Hi,
I am having trouble with my Snow Leopard machines (Mac Pro with 10.6.8). Most of time Macs will work fine but then all of sudden they will not allow any users to login (Not even local users). I have tried 3 locals accounts and root account as well but none of them will work. I have tried ARD to remote in but it will not work. Also tried to use SSH but it won't let me connect.
The only work around this issue which I have just to reboot that machine then all users can login.
Does anyone know how to fix this issue?
Thanks,

Hi,
When I see the machine sitting at login screen and I try to login using few different accounts (Local, AD, even root), it would shake and not go anywhere.
It will be really hard tell that something is goin on with that machine because there is no visible signs of any trouble until you try to login.
I am assuming that it should let login using local accounts even though there might be an issue with network which would cause a problem if AD accounts are used but nothing works at that login prompt, until I restart that machine.
Once the machine is re-booted then I can login with all the local accounts and re-check the active diretory settings to make sure that AD accounts can login. At this point problem will disappear for a while then few days later it will show up again randomly on different machines.
I have done all the OS X updates on all the machines using ARD but nothing seems to be working yet.
At this stage, couple of things come to mind:
Something went wrong with that lab image and I need to rebuild it which I will do it at later time. For right now I am only looking for temporary fix.
Using ARD, I have only done OS X updates but not the firmware update which might be causing this issue.
@Sanjampet: - I don't think that there is an issue with my password becasue it seems to be working after I have restarted that machine.
Thanks,

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Snow Leopard machine will not allow anyone log in until reboot

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