title: In IIS, why app in application pool always stops and IIS service becomes Unavailable (503)
body: <p>I have changed my domain user's password, run iisreset many times and I met this problem</p>
  
  <p>It was fine to open my local site at the first time, but if I refresh it or click any link on that page (which is also in my local server) I always got a 503 error Service Unavailable.</p>
  
  <p>And the app relates to the unavailable site also automatically stopped, even after I manually restart it. If I tried to restart the app, it said it could not start if WAS (windows activation service) service is not running. But restarting the WAS service didn't help anything.</p>
  
  <p>Even if I run iisreset, the local website is still available only at the first (or second) visit.</p>
  
  <p>Any one knows how to solve this problem ?</p>
  
  <p>PS: My system is windows 2012 R2, IIS version is 6.2</p>
  
  <p>Thanks</p>