How to Fix VNC Viewer “Access is Denied” Error? Step-by-Step Guide

For Windows

1. 1. Step 1.Right-click on the Start button and select Computer Management.
   2. Step 2.Connect your iPhone to computer using a USB cord. Next click “Start to Unlock” to let the process begin.
   3. Step 3.In the left pane, expand Local Users and Groups and click on Groups.
   4. Step 4.In the right pane, double-click on Administrators to see the list of users.

For macOS

1. 1. Step 1.Open System Preferences and select Users and Groups.
   2. Step 2.Click the lock icon to unlock and enter an administrator password if prompted.
   3. Step 3.Check if the user’s account appears under the Admin.
   4. Step 4.To grant connection access to additional users and groups, you must add them to the Users and Permissions section of the RealVNC Server.

1. 1. Step 5.You can choose to add either a group of pre-registered users or individual accounts, with the option to register users from both local and domain accounts.
   2. Step 6.When operating RealVNC Server on Windows, you can select users and groups using the Object Picker interface.

1. 1. Step 7.After adding the user, you can configure the appropriate permissions for that user or group, allowing them to authenticate successfully.

1. 1. Step 1.Open the RealVNC Viewer.
   2. Step 2.Click on the red cross next to your name at the top right corner of the window.

1. Step 3.Click on Log In and enter your updated RealVNC account credentials (email and new password).
2. Step 4.Ensure you see a green check mark next to your name, indicating a successful sign-in.

1. 1. Step 1.Download it and utilize the interface to add users or groups and assign permissions as needed.
   2. Step 2.Click the Refresh Parameter button to generate string permission in the right format.

1. 1. Step 3.On Windows, user and group names will be automatically converted into security identifiers (SIDs). Note that groups are denoted with a % preceding the SID.

      The VNC Permissions Creator also allows you to convert a parameter value into a more user-friendly format. This feature is particularly beneficial for Windows users, as it can translate SIDs into recognizable user and group names. To do this, paste the parameter value into the Permissions Parameter area and click the Refresh Users and Groups button.

      Also, to register a local user account or group (as opposed to a domain or built-in Windows account), use the following syntax:

      • Use <LOCAL> for user accounts.
      • Use %<LOCAL> for groups.
   2. Step 4.For instance, if you need to configure five computers where three have a local account named TestUser, directly specify the <LOCAL> syntax in the Permissions Parameter area.

1. 1. Step 5.By applying the permissions string to these five computers, users will be able to authenticate to RealVNC Server using the credentials.

1. Step 6.However, computers that cannot resolve the TestUser account will deny access until a local account with that name is created.

1. 1. Step 1.Click on the Start menu (Windows icon) in the lower-left corner of your screen.
   2. Step 2.Type Control Panel in the search bar and press Enter to open it.
   3. Step 3.In the Control Panel, navigate to Programs and then select Programs and Features (or simply Uninstall a program depending on your view settings).

1. 1. Step 4.Download the VNC viewer again. Choose the appropriate version of VNC Viewer for your operating system (Windows, macOS, or Linux) and click on the download link to begin downloading the installer.

1. Step 5.Once the download is complete, double-click on the installer file to launch the installation process.
2. Step 6.Follow the on-screen instructions to complete the installation. This typically includes accepting the license agreement, choosing an installation directory, and configuring any desired settings.
3. Step 7.Enter the connection details for the RealVNC Server you wish to access and attempt to connect.
4. Step 8.Check if the issue has been resolved and you can now connect successfully.