Also, you should clarify why it is that turning UAC off might break applications -- specifically, filesystem and registry virtualization is not active when UAC is off, but that's more likely to reset a user's configuration of an app than it is to break the entire app's installation.
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Podcast Explaining the semiconductor shortage, and how it might end. Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. Linked 3. Related 2. Filtered Token: When a user who has administrative or other powerful privileges or group memberships logs on, Windows creates two access tokens to represent the user account. The "unfiltered" token has all the user's group memberships and privileges, whereas the "filtered" token represents the user with the equivalent of standard user rights.
By default, this filtered token is used to run the user's programs. The unfiltered token is associated only with elevated programs. An account that is a member of the Administrators group and that receives a filtered token when the user logs on is called a "Protected Administrator" account. User Interface Privilege Isolation UIPI : UIPI prevents a lower-privileged program from sending window messages such as synthetic mouse or keyboard events to a window that belongs to a higher-privileged process and by doing this controlling the higher-privileged process.
By default, Protected Mode is enabled when a user browses sites in the Internet or Restricted Sites zones. PMIE makes it more difficult for malware that infects a running instance of Internet Explorer to change the user's settings, such as by configuring itself to start every time that the user logs on. Installer Detection: When a new process is about to be started without administrative rights, Windows applies heuristics to determine whether the new process is likely to be a legacy installation program.
Windows assumes that legacy installation programs are likely to fail without administrative rights. Therefore, Windows proactively prompts the interactive user for elevation. Be aware that if the user does not have administrative credentials, the user cannot run the program. Legacy applications that have standard user rights that expect to write to protected folders or registry keys will fail. Filtered tokens are not created, and all programs run with the full rights of the user who is logged on to the computer.
This includes Internet Explorer because Protected Mode is disabled for all security zones. One of the common misconceptions about UAC and about Same-desktop Elevation in particular is that it prevents malware from being installed or from gaining administrative rights.
First, malware can be written not to require administrative rights, and malware can be written to write just to areas in the user's profile. More important, Same-desktop Elevation in UAC is not a security boundary and can be hijacked by unprivileged software that runs on the same desktop. Same-desktop Elevation should be considered a convenience feature, and from a security perspective, "Protected Administrator" should be considered the equivalent of "Administrator.
For more information about security boundaries, see the "References" section. For a Windows-based server on which the sole reason for interactive logon is to administer the system, the goal of fewer elevation prompts is neither feasible nor desirable.
See screen shot below. Beware that if you are connected to the internet, then sites may have rogue programs that mimic this menu and trick you into installing Spyware. As with so much of Windows Server , Microsoft has redesigned what an ordinary user, or a base-level user can do. Surprisingly, some security settings have been loosened; if a task does not pose a security threat then Windows Server lets an ordinary user perform that task.
For example, in Windows Server users can now alter the Keyboard, mouse or adjust the Power Settings. Naturally if you feel that certain users are getting too much power, then you can clip their wings with Group Policies, which are now increased from 1, in XP to 3, in Windows Server NTM will produce a neat diagram of your network topology. Other neat features include dynamic update for when you add new devices to your network.
I also love the ability to export the diagrams to Microsoft Visio. Finally, Guy bets that if you test drive the Network Topology Mapper then you will find a device on your network that you had forgotten about, or someone else installed without you realizing! If you are familiar with concept of Kerberos in Windows Server , you may already know that once a user logs on successfully, the operating system supplies them with a security token.
That token has their privileges and group membership. The whole idea is that the user does not have to keep typing in their password every time they need to open a file or print.
User Account Control extends this idea by supplying what some call a split token and other call two tokens. What ever the semantics, the idea is that to perform jobs such as checking their email or updating their spreadsheets, the Administrator relies on the lesser token, the one with minimal rights.
Suppose that same user account now needs to carry out a higher level administrative task, for example, changing a DNS record or amending a DHCP scope option; at this point they need to switch to the other full token, known as Administrator Approval Mode. Imagine a user launching a snap-in from the MMC. The Windows Windows Server shell calls CreateProcess, which then queries the application to see whether it requires elevated privileges.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Under certain constrained circumstances, disabling UAC on Windows Server can be an acceptable and recommended practice. These circumstances occur only when both the following conditions are true:. If either of these conditions isn't true, UAC should remain enabled.
For example, the server enables the Remote Desktop Services role so that nonadministrative users can sign in to the server to run applications.
UAC should remain enabled in this situation. Similarly, UAC should remain enabled in the following situations:. UAC was designed to help Windows users move toward using standard user rights by default. UAC includes several technologies to achieve this goal. These technologies include:. File and Registry Virtualization: When a legacy application tries to write to protected areas of the file system or the registry, Windows silently and transparently redirects the access to a part of the file system or the registry that the user is allowed to change.
It enables many applications that required administrative rights on earlier versions of Windows to run successfully with only standard user rights on Windows Server and later versions. Same-desktop Elevation: When an authorized user runs and elevates a program, the resulting process is granted more powerful rights than those rights of the interactive desktop user. By combining elevation with UAC's Filtered Token feature see the next bullet point , administrators can run programs with standard user rights.
And they can elevate only those programs that require administrative rights with the same user account. This same-user elevation feature is also known as Admin Approval Mode. Programs can also be started with elevated rights by using a different user account so that an administrator can perform administrative tasks on a standard user's desktop.
Filtered Token: When a user with administrative or other powerful privileges or group memberships logs on, Windows creates two access tokens to represent the user account. The unfiltered token has all the user's group memberships and privileges.
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