![]() It provides robust IIS logging and works as a great IIS error log. Failed Request Tracing for Advanced IIS Error Logsįailed request tracing (FRT) is probably one of the least used features in IIS. It knows how to instrument into IIS features. Depending on if you are using WebForms, MVC, Core, WCF or other frameworks, you may have issues with ASP.NET not writing any errors at all to ASP.NET due to compatibility issues with the health monitoring feature.īy the way, if you install Retrace on your server, it can catch every single exception that is ever thrown in your code. You may not be able to find your exception in the EventLog. You can also disable writing any errors to the Application EventLog. So you may not find your error!īy default, it will only log the same type of error once a minute. Very few people realize that the number of errors written to the Application EventLog is rate limited. You can control settings for it via system.web/healthMonitoring in your web.config file. This is handled by the ASP.NET Health Monitoring feature. Look for ASP.NET Exceptions in Windows Event Viewerīy default, ASP.NET will log unhandled 500 level exceptions to the Windows Application EventLog. The built-in error messages and error codes from HTTP.SYS are usually very detailed.Ĭ:\Windows\System32\LogFiles\HTTPERR 3. These type of errors get logged in HTTPERR.Ĭommon errors are 400 Bad Request, timeouts, 503 Service Unavailable and similar types of issues. Incoming requests to your server first route through HTTP.SYS before being handed to IIS. If IIS is running, but you still are not seeing the log events, it may be going to HTTPERR. It is also possible IIS Loggin is disabled. If it doesn’t, it is possible that the request never made it to IIS, or IIS wasn’t running. Can’t Find Your Request in the IIS Log? HTTPERR is Your IIS Error Log.Įvery single web request should show in your IIS log. For example, “/webapp2.” This can instantly direct you to problem spots in your application.Īnother key piece of info to look at is “time-taken.” This gives you the roundtrip time in milliseconds of the request and its response.īy the way, if you are using Retrace, you can also use it to query across all of your IIS logs as part of its built-in log management functionality. You can also see the endpoint the log message is for under “cs-uri-stem”. ![]() The “sc-win32-status” can provide more details that you won’t know unless you look up the code. The “sc-status” and “sc-substatus” fields are the standard HTTP status code of 200 for OK, 404, 500 for errors, etc. ![]() #Fields: date time s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) cs(Referer) sc-status sc-substatus sc-win32-status time-taken These status codes can help identify the actual error in more detail. Need help finding your logs? Check out: Where are IIS Log Files Located?īy default, each logged request in your IIS log will include several key fields including the URL, querystring, and error codes via the status, substatus and win32 status. You should find your logs in folders that are named by your W3SVC site ID numbers. Click on this, and you can verify that your IIS logs are enabled and observe where they are being written to. Via IIS Manager, you can see a “Logging” feature. Standard IIS logs will include every single web request that flows through your IIS site. There are some other places to look if you are looking for more detailed error messages or can’t find anything in your IIS log file. Such logs are only the beginning of your troubleshooting toolbox. If you have been dealing with ASP.NET applications for a while, you may be familiar with normal IIS logs.
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