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During the last period I'm experiencing a problem on file server; sometimes
all my client can't reach the share on file server (admin share too).

In event viewer there aren't particular errors. If i try to restart the
"server" service it doesn't stop. Only solution is to restart the server.
During the night I've never experienced the problem. May be a denial of
service attack? or...any idea on something to check?

thanks
Fabio