AbortRequest与Forbidden的区别是什么？仅为数值差异吗？

Great question—at first glance, these two settings do sound nearly identical, but there’s a critical functional difference beyond just their assigned numbers. Let’s break this down clearly:

What Each Setting Actually Does #

• AbortRequest (数值 0): When this is set, IIS immediately terminates the client connection without sending a standard HTTP response. The client will get a connection reset error (your browser might show something like "This site can’t be reached" instead of a proper error page). This is a "silent" block—attackers won’t receive a clear HTTP status code indicating they’ve been blocked.
• Forbidden (数值 403): This triggers IIS to send a formal 403 Forbidden HTTP response to the client. The browser will display either the default 403 error page or your custom error page, explicitly communicating that access is denied.

Core Distinction #

The difference isn’t just about the number:

• AbortRequest cuts the connection off abruptly with no HTTP feedback.
• Forbidden sends a standardized, clear HTTP status code that tells the client exactly why access was rejected.

So your choice depends on your goal—whether you want to hide that you’re blocking a client, or clearly communicate the denial to the user.

内容的提问来源于stack exchange，提问作者Mohamed Farrag