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Here's the problem. 11.30 yesterday all our internet servers appeared to stop working. Turns out that the reason for this is the services no longer had NTFS file access to the data (accessed as a network share). The user permissions had simply disappeared, or rather been replaced with "Unknown User". Note the user account was not corrupt as it had access to other shares on the system.

I know how to manually add the permissions back, but this is taking ages (over 200,000 files !).

My question is HTF did the user permissions get corrupted without human intervention?

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