When implementing anonymous authentication in IIS, the IUSR account is used by default, but you can specify a specific account for better control of permissions by configuring. 1. Open IIS Manager and select the site; 2. Double-click "Authentication" to enable "Anonymous Authentication"; 3. Edit settings, select "Specific User" and enter the target username and password. Notes include: Ensure that the account has sufficient permissions to the website directory, log directory, temporary directory, etc.; when using a domain account, you need to enter the complete format; it is recommended to assign the minimum necessary permissions. Applicable scenarios include access to remote resources, application pool isolation, security audit trail, etc. After correct configuration, the controllability of permission management and log tracking can be improved.

When implementing anonymous authentication in IIS, by default, IIS's built-in anonymous user account (usually IUSR). But in some scenarios, you may want to use a specific existing user account when accessing anonymously, such as a domain account or local account. Doing so will enable better control of permissions, especially when accessing network resources or performing operations that require specific permissions.

This is actually not complicated, but requires manual configuration of several key points.

Configure anonymous authentication and specify a specific user account

First, you need to make sure that anonymous authentication is enabled and other unwanted authentication methods are disabled. Then, change the default anonymous account to the account you want to specify.

The operation steps are as follows:

• Open IIS Manager
• Select your website or application
• Double-click the "Authentication" function
• Enable "Anonymous Authentication"
• Right-click "Anonymous Authentication" and select "Edit"
• Select "Specific User" in the pop-up window and click "Settings"
• Enter the username and password you want to use

In this way, IIS will run as the account when it is anonymously accessed.

Notes: Account permissions and access control

After using a specific account, you must ensure that the account has sufficient read and write permissions to the website folder, log directory, temporary directory, etc. Otherwise, an error of 401 or 500 will appear.

Frequently asked questions include:

• Account does not have permission to access the website physical path
• No write permissions to temporary ASP.NET folders
• When using a domain account, the full username format was not entered correctly (such as domain\user)

The recommended approach is:

• Assign the minimum necessary permissions to the account to avoid giving administrator permissions directly
• If using a domain account, please confirm whether the account is allowed to log in on the target server
• It is best to use a simple page to troubleshoot code issues when testing the test visit

Applicable scenario: Why do you need to specify a specific account?

Although the default IUSR account already meets most cases, it is more appropriate to use a specific account in the following typical scenarios:

• Applications need to access remote shared resources (such as UNC paths)
• Different anonymous access identities need to be isolated between multiple application pools
• Security audit requires a clear idea of the actual running account for each anonymous request

This approach can make permission management and log tracking clearer and more controllable.

Basically that's it. The configuration process is not complicated, but it is easy to ignore the issue of account permissions or path access. Just set up the user account and make sure it has enough permissions to run smoothly.

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