Http Error 503 Iis 7.0
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17, 20102 Share 0 0 Symptoms So a co-worker of mine was setting up IIS 7.0 on a new Windows 7 machine, and when they were browsing to http://localhost they were getting a 503 Service Unavailable error as shown here: Troubleshooting This seemed pretty trivial so I went through the following checklist. Is W3SVC started? Yes Is the Default Web Site started? Yes Is the Application Pool Disabled? No Is the Application Pool http://stackoverflow.com/questions/13322937/iis-http-error-503-the-service-is-unavailable Started? Yes Is the w3wp.exe process for the application running? No Are their any WAS or W3SVC Events in the Application or System Event logs? No Are their any entries in the IIS Log for the web site? No Are their any entries in the HTTP error logs? Yes 2010-02-17 17:28:47 ::1%0 49991 https://blogs.msdn.microsoft.com/webtopics/2010/02/17/a-not-so-common-root-cause-for-503-service-unavailable/ ::1%0 80 HTTP/1.1 GET / 503 - N/A - So what could be going on here? After a bit of troubleshooting I was able to find a event in the event log that led me in the correct direction. Here is a summary of the event: Log Name: SystemSource: Microsoft-Windows-HttpEventDate: 2/17/2010 9:26:44 AMEvent ID: 15007Task Category: NoneLevel: InformationKeywords: ClassicUser: N/AComputer: computer.domain.comDescription:Reservation for namespace identified by URL prefix http://+:80/ was successfully added.Event Xml:
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is a common and frustrating problem that may occur for a number of reasons after a configuration change, or when deploying a new server machine. Another common "what the hell just happened" error is the plain 503 “service available” error that looks like this: Update: We recently launched a service that significantly helps you understand, troubleshoot, and improve IIS and ASP.NET web applications. If you regularly troubleshoot IIS errors, manage Windows Servers, or tune ASP.NET performance, definitely check out the demo at www.leansentry.com. What is it? This error is generated by the WAS (formerly W3SVC) service, which is responsible for creating IIS worker processes to handle incoming http requests. When WAS fails to create a worker process, it will generate this error. Why does it happen? There are a number of reasons why WAS may fail to start an IIS worker process. These include invalid application pool configuration, failure to create the process due to incorrect application pool identity settings, bad IIS configuration that causes the worker process to fail to initialize, or a process crash due to application logic. I will list the most probable reasons and how to investigate / fix them below. How do I get rid of it? Let’s get rid of it in 4 easy steps: STEP 1: Check whether your application pool is stopped Once WAS fails to start your worker process a set number of times, it goes into Rapid Fail Protection Mode and stops the application pool. This prevents application crashes from taking down the machine by going into a start process / fail loop when a persistent error exists. By default, Rapid Fail Protection is set at 5 times in 5 minutes. Once the application pool that contains your application has been stopped, all requests to applications in it will result in that plain 503 error. So, that’s the first thing we check: > %systemroot%windowssystem32inetsrvAppCmd.exe list apppools If your application pool is stopped, then we are on the right track. The next step is to check the event log for information about why your worker process could not be started. STEP 2: Check event log If IIS inside the worker process fails to initialize, or WAS is unable to create the worker process, it will log an event to the “Application” or “System” windows event log respectively. Let’s check this next: > eventvwr Nav