If you are analysing the IIS log file by default the sc-status and sc-substatus not recorded in the log files, you need enable at Advance log by fields level to record. When you enable fields level the system will provide Http return result code. The code details given below.
This time the first request is returning a status of 301 (Object Moved Permanently) and a sub status of 0 which is not used.
The second request returns a status of 403 (Forbidden) and a sub status of 14 (Directory Listing Denied)
1xx - Informational
These status codes indicate a provisional response. The client should be prepared to receive one or more 1xx responses before receiving a regular response.
100 - Continue.
101 - Switching protocols.
2xx - Success
This class of status codes indicates that the server successfully accepted the client request.
200 - OK. The client request has succeeded.
201 - Created.
202 - Accepted.
203 - Non-authoritative information.
204 - No content.
205 - Reset content.
206 - Partial content.
3xx - Redirection
The client browser must take more action to complete the request. For example, the browser may have to request a different page on the server or repeat the request by using a proxy server.
301 - Moved Permanently
302 - Object moved Temporarily
303 - See Other
304 - Not modified.
307 - Temporary redirect.
4xx - Client Error
An error occurs, and the client appears to be at fault. For example, the client may request a page that does not exist, or the client may not provide valid authentication information.
400 - Bad request.
401 - Access denied. IIS defines a number of different 401 errors that indicate a more specific cause of the error. These specific error codes are displayed in the browser but are not displayed in the IIS log:
401.1 - Logon failed.
401.2 - Logon failed due to server configuration.
401.3 - Unauthorized due to ACL on resource.
401.4 - Authorization failed by filter.
401.5 - Authorization failed by ISAPI/CGI application.
401.7 – Access denied by URL authorization policy on the Web server. This error code is specific to IIS 6.0.
403 - Forbidden. IIS defines a number of different 403 errors that indicate a more specific cause of the error:
403.1 - Execute access forbidden.
403.2 - Read access forbidden.
403.3 - Write access forbidden.
403.4 - SSL required.
403.5 - SSL 128 required.
403.6 - IP address rejected.
403.7 - Client certificate required.
403.8 - Site access denied.
403.9 - Too many users.
403.10 - Invalid configuration.
403.11 - Password change.
403.12 - Mapper denied access.
403.13 - Client certificate revoked.
403.14 - Directory listing denied.
403.15 - Client Access Licenses exceeded.
403.16 - Client certificate is untrusted or invalid.
403.17 - Client certificate has expired or is not yet valid.
403.18 - Cannot execute requested URL in the current application pool. This error code is specific to IIS 6.0.
403.19 - Cannot execute CGIs for the client in this application pool. This error code is specific to IIS 6.0.
403.20 - Passport logon failed. This error code is specific to IIS 6.0.
404 - Not found. 404.0 - (None) – File or directory not found.
404.1 - Web site not accessible on the requested port.
404.2 - Web service extension lockdown policy prevents this request.
404.3 - MIME map policy prevents this request.
404.4 - No Handler (IIS 7)
404.5 - Request Filtering: URL Sequence Denied (IIS 7)
404.6 - Request Filtering: Verb denied (IIS 7)
404.7 - Request Filtering: File extension denied (IIS 7)
404.8 - Request Filtering: Denied by hidden namespace (IIS 7)
404.9 - Denied since hidden file attribute has been set (IIS 7)
404.10 - Request Filtering: Denied because request header is too long (IIS 7)
404.11- Request Filtering: Denied because URL doubled escaping (IIS 7)
404.12 - Request Filtering: Denied because of high bit characters (IIS 7)
404.13 - Request Filtering: Denied because content length too large (IIS 7)
404.14 - Request Filtering: Denied because URL too long (IIS 7)
404.15- Request Filtering: Denied because query string too long (IIS 7)
405 - HTTP verb used to access this page is not allowed (method not allowed.)
406 - Client browser does not accept the MIME type of the requested page.
407 - Proxy authentication required.
412 - Precondition failed.
413 – Request entity too large.
414 - Request-URI too long.
415 – Unsupported media type.
416 – Requested range not satisfiable.
417 – Execution failed.
423 – Locked error.
5xx - Server Error
The server cannot complete the request because it encounters an error.
500 - Internal server error.
500.12 - Application is busy restarting on the Web server.
500.13 - Web server is too busy.
500.15 - Direct requests for Global.asa are not allowed.
500.16 – UNC authorization credentials incorrect. This error code is specific to IIS 6.0.
500.18 – URL authorization store cannot be opened. This error code is specific to IIS 6.0.
500.100 - Internal ASP error.
501 - Header values specify a configuration that is not implemented.
502 - Web server received an invalid response while acting as a gateway or proxy.
502.1 - CGI application timeout.
502.2 - Error in CGI application.
503 - Service unavailable. This error code is specific to IIS 6.0.
504 - Gateway timeout.
505 - HTTP version not supported.