I'm having a weird problem with one of my IIS 7.5 boxes. One of my coworkers rebooted the primary domain controller and after it came backup the IIS box started give out 503 errors. I restarted IIS and it didn't help, rebooting the box did take care of it. The application is a asp.net application.
There was nothing in the event log that I could see, in the httperr log there were lines like:
2011-12-07 15:03:47 220.127.116.11 8677 18.104.22.168 80 HTTP/1.1 GET / 503 1 AppOffline www.thegreensheet.com
My question is: why did IIS go down, and what can I do to protect it from going down?
Thanks for your help.