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Question Rephrased:

On our NAS, I have 3 LUNS created (I do not know if this is the cause of the problem).

On my DC, I have attached them using iScsi, and have created them as a disk. On that Disk I created folders so my users can access and use.

For each folder, the Sharing settings are for Everyone: R/W enter image description here enter image description here

After some time (noticed more after reboots) everyone looses access to the drives. What I need to do in order to bring it back is: Check the checkbox for: Do not share this folder. Press OK. And than check the : Share this folder. This I need to do for every folder on the drive.

The security settings I have are for Authenticated Users full control. enter image description here

Why is it happening?

share|improve this question
You've given us almost zero information here, seriously, how on earth could we answer this, just no details whatsoever. I'll close the question very soon if you don't add more. – Chopper3 Sep 14 '11 at 9:17
I don't see how LUNs are relevant here yet the acronym appears both in the question title and 3 times in the question. – Joshua Hoblitt Sep 14 '11 at 9:57
I have edited the question to give as much information as I can – Saariko Sep 15 '11 at 6:17
up vote 2 down vote accepted

The problem was that our NAS that hosts the LUNS, had a scheduled restart every Sunday morning. And the server does not refreshes the links to the attached LUNS.

I have cancelled the restarts, and now all is well.

share|improve this answer
Who can be so crazy to schedule a weekly restart on a SAN?!? :-O – Massimo Oct 11 '11 at 10:23
Whoever it is, he must be related to the BOFH somehow. – the-wabbit Oct 11 '11 at 12:47

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