Hi 1) When i try assign custom domain group (group created by myself) for security tab on local directory on my stations, the explorer crash. 2) If assign domain user or native groups like "Authenticated users", it's work fine 3) If i take remote drive on station like \\mystation\c$ on my server and get anygroup ou users in security tab. it's work fine 4) the servers is ok 5)I try dissabling my A/V softwar e without result I restarted all servers of authentification, scan for virus and check event log for abnormal message. I don't know what's the problem. It's begin there are 1 week ago