IIS日誌記錄到兩個不同文件夾的原因及解決方法如下：1.多個站點(diǎn)或應(yīng)用程序各自配置了獨(dú)立日誌路徑，可在IIS管理器中統(tǒng)一設(shè)置；2.應(yīng)用池身份權(quán)限或共享配置導(dǎo)致路徑不一致，需標(biāo)準(zhǔn)化路徑並檢查權(quán)限；3.代碼或web.config中自定義日誌路徑，需檢查配置文件及代碼中的日誌設(shè)置。通過核查以上配置可解決日誌分散問題。

If you're seeing IIS (Internet Information Services) logging to two different folders, it's not a bug — it's usually due to how IIS is configured. This behavior often catches admins off guard, especially when troubleshooting or setting up log collection systems. Here's why it might be happening and what you can do about it.

Multiple Sites or Applications in IIS

One of the most common reasons IIS logs go to different folders is that you're running multiple websites or applications under the same server. Each site or application in IIS can have its own logging path configured independently.

• For example, if you have a main site ( Default Web Site ) and an API hosted under a separate application ( /api ), each can be configured to write logs to different folders.
• You can check this by opening IIS Manager, selecting each site or app, and looking at the Logging feature.

To fix or standardize this:

• Go to each site/application in IIS Manager
• Double-click "Logging"
• Set the same directory path under "Log file name" if you want logs in one place
• Make sure the application pool identity has write access to that folder

Application Pools and Shared Configurations

Another possible cause is the use of shared configurations or multiple application pools . If you're using shared configuration (like in a web farm), or if multiple application pools are involved, the logging paths might not be consistent unless explicitly configured.

• Application pools can affect how and where logs are written, especially if the identity running the pool doesn't have permissions to the desired log folder.
• Also, if you're using a shared configuration across multiple servers, each server might be writing logs locally to its own folder.

To avoid confusion:

• Standardize the logging path across all servers/sites
• Use UNC paths if centralized logging is the goal
• Check permissions on the log folder for the application pool identity

Custom Logging Paths in Web.config or Code

Sometimes the reason is not visible in IIS Manager at all — it might be set programmatically or through configuration files like web.config .

• If your application uses custom HTTP modules or middleware (eg, in ASP.NET Core), logging behavior can be overridden in code.
• Also, some third-party modules or frameworks might change the logging destination dynamically.

To investigate:

• Look for any logging-related configuration in web.config
• Search for references to logFile or logging in code or configuration files
• If using ASP.NET Core, check Program.cs or Startup.cs for logging setup

In short, IIS logs going to two different folders usually comes down to how sites, applications, or configurations are set up. Once you look at each site's logging settings and check for custom or programmatic overrides, you'll usually find the cause.基本上就這些.

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