sc-win32-status is a field in the IIS log that records the status of Windows system calls, which is used to reflect the underlying error cause when the server processes the request. 1. Common values include 0 (operation successfully), 64 (network not available), 127 (resource not found), 5 (access denied), 13 (data invalid), and 183 (object already exists). 2. The methods to find the meaning are: use the net helpmsg command, PowerShell's [ComponentModel.Win32Exception] class, and consult Microsoft's official documents. 3. The difference with sc-status is that sc-status is HTTP standard code such as 200 and 404, while sc-win32-status is Windows layer error code such as 5 and 64. 4. Pay attention to non-0 values, normal page but poor performance, security module interception, complex debugging scenarios, etc. Understanding this field can help in troubleshooting IIS issues in depth.

When analyzing IIS logs, sc-win32-status is a often confusing field. It records the status code returned by the underlying Windows system call when the server processes the request, and is usually used in conjunction with sc-status (HTTP status code) to troubleshoot problems. Simply put, sc-win32-status represents a more underlying cause of errors . Sometimes, even if the HTTP status is 200, this field may prompt a potential problem.

Common sc-win32-status values and meanings

• 0 : The operation completed successfully, no errors.
• 64 : The specified network name is no longer available. This can occur when the client disconnects or timeouts.
• 127 : The specified resource cannot be found. It may be a URL path error or module configuration problem.
• 5 : Access is denied. Improper permission configuration results in, such as application pool authentication accounts do not have permission to access a directory.
• 13 : The data is invalid. Commonly when requests are intercepted by URLScan or other security modules.
• 183 : An object with the same name already exists. Usually a log file write conflict or a repeated initialization of certain components.

These status codes are not part of the HTTP protocol, but Win32 error codes from Windows, so understanding them requires some system-level knowledge.

How to find the specific meaning of sc-win32-status

If you see a strange sc-win32-status value, you can check it like this:

• Using the command line tool net helpmsg <code> (for example, net helpmsg 5 ), the Windows-owned help command will display the corresponding description.
• Run [ComponentModel.Win32Exception] $code in PowerShell, and you can also quickly view the explanation.
• Check the list of Win32 error codes in the official Microsoft documentation.

Remember, the explanations given by these methods are usually common, and combining your IIS configuration, request paths, and log context can accurately determine the root cause of the problem.

Relationship and difference with sc-status

Many people don't understand the difference between sc-status and sc-win32-status :

• sc-status is a standard HTTP status code, such as 404, 500, and 200, representing the results seen by the client.
• sc-win32-status is the status code at the Windows level inside the server, reflecting the underlying problems encountered by the server during execution.

For example: If the user requests a large file and disconnects during the transfer process, you may see sc-status=200 (because the server starts sending responses normally), but sc-win32-status=64 (indicates network interruption).

Therefore, when troubleshooting problems, you need to look at these two fields together to fully understand what is happening.

In what circumstances should you pay attention to sc-win32-status

• Values that appear in the log with non-0 : especially the frequent occurrence of values such as 5, 64, and 127, indicating that there is a potential problem.
• While the page looks normal, it does not perform well : some underlying errors do not prevent the response from completing, but can affect speed or stability.
• Security module intercepts requests : After a URLScan or firewall rule is triggered, it often leaves traces on sc-win32-status .
• When debugging complex problems : such as intermittent failure, interruption of upload and download, authentication exception, etc.

When encountering these situations, don't just stare at the HTTP status code and see what extra clues sc-win32-status provides.

Basically that's it. Although it is not as intuitive as HTTP status codes, sc-win32-status can often provide critical information when in-depth investigation of the reasons for the failure of IIS requests.

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