The group Everyone
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It's probably not a good idea for you to leave things the way they are by default when you initiate sharing of a file or folder, Adesh reminds us.
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When sharing a file or folder the default group to which permissions is applied to is the group 'everyone'.
Everyone includes all users who can access the system. Be careful about assigning resources to the group 'everyone,' primarily because this could accidentally allow unauthenticated users to access the system.
Never assign the group 'everyone' to have access to a file share on your network. Use 'aAuthenticated users' instead. This group's membership is controlled by the operating system or domain. 'Authenticated users' includes all users who are authenticated into the network by using a valid user account. Using the 'authenticated user' group in place of the group 'everyone' can prevent anonymous access to resources. The 'authenticated user' group does not contain anonymous users or guests.
Of course disabling the guest account prevents this account from being part of the 'everyone' group, which in turn prevents permissions from being granted to some guest logon.
Adesh Rampat has 10 years experience with network and IT administration. He is a member of the Association of Internet Professionals, the Institute for Network Professionals and the International Webmasters Association. He has also lectured extensively on a variety of topics.
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Configuring Windows 2000 Server Security
Author : Syngress Media
Publisher : Syngress, Media
Published : Nov 1999
Microsoft has incorporated dramatic new security changes in Windows 2000 Server, including Kerberos Authentication, Public Key Infrastructure (PKI), IP Security (IPSec), Encrypting File System (EFS), and Active Directory permissions. This book is an indispensable guide for anyone bearing the responsibility for the overall security of a Windows 2000 Server network.