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Before you go and suggest it as a duplicate of other IIS HTTP Error 503 questions, I have already tried many solutions available on SO and also on Google but the problem is not resolved. Below are the most popular solutions that I have found:

IIS - HTTP Error 503. The service is unavailable

Solve HTTP Error 503. The service is unavailable in IIS

In my case:

IIS is not working while the port 80 is open and free to use.

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As far as I know the error is caused if the application pool is not enabled (started) for the website in IIS.

I have already closed all other applications like Skype, Google Disk etc who can possibly use port 80 and checks if the port is in use or not.

enter image description here

Then I looked into the Application Pools of IIS and found DefaultAppPool status stopped.

enter image description here

After starting the DefaultAppPool I recheck my web and gets the same error.

And now the situation is like, DefaultAppPool status shows started until I don't hit any URL. Whenever I request any URL for my local websites or localhost, the browsers returns me the Service Unavailable error message and the DefaultAppPool status change to stopped automatically.

I have already tried the iisreset command but after resetting IIS the problem is still there.

Suhaib Janjua
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  • Basicly error 503 means that somthing is wrong in your code or in your web server. I would sugest the you'll try to change your website application pool to the asp.net 4 app pool (the second one in the list). I had the exact problem after installing framework 4.5. After moveing the application to the asp.net v4 it solved. – Tomer Klein Feb 03 '15 at 15:53
  • @Tomer Klein I have already change the Application pool to Asp.net 4 app pool but still same error and also created a custom app pool as test but the browser returns the same error. – Suhaib Janjua Feb 03 '15 at 15:54
  • Bytheway it gives the same either I access my deployed websites or simple localhost to check if the IIS is running or not. – Suhaib Janjua Feb 03 '15 at 15:56
  • So what event log shows? – Alexei Levenkov Feb 03 '15 at 15:58
  • Have you try looking in the windiws event viewer under application/system log? – Tomer Klein Feb 03 '15 at 15:58
  • @TomerKlein **Error** Application pool DefaultAppPool has been disabled. Windows Process Activation Service (WAS) encountered a failure when it started a worker process to serve the application pool. – Suhaib Janjua Feb 03 '15 at 16:09

2 Answers2

8

There is an uncommon cause for 503 error. To fix this, follow these easy steps:

Run this command 

netsh http show urlacl

It will list all reserved urls, find the url with relevant port.

 Reserved URL            : http://+:80/
    User: NT SERVICE\Machine
        Listen: Yes
        Delegate: No
        SDDL: D:(A;;GX;;;S-1-5-21-2127521184-1604012920-1887927527-67210)

Then delete the entry with this command (replace the url part with yours):

netsh http delete urlacl http://+:80/

https://blogs.msdn.microsoft.com/webtopics/2010/02/17/a-not-so-common-root-cause-for-503-service-unavailable/

ozanmut
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2

Most probably identity under which you are running your app pool i.e. administrator has wrong password or disabled. Try changing this identity to something like network service or local service or any other valid identity.

Pankaj Kapare
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