Hello,
I have very weird situation happening from time to time. Scenario: IIS 8.5 with about 1.5k websites. App pool after 20-30 minutes is being terminated. They all work under 32bit. From time to time (once in a month maybe?) I'm experiencing a situation:
- clients are trying to access their websites are getting permanent loading experience (timeout)
- not all websites are being affected because some of them are working just fine
- solution for this problem is performing iisreset
- restarting website or app pool is not helping
Observations:
- websites which stopped responding / are permanently loading stopped responding in different time (IIS logs shows very different times when they just stopped responding -> no new entries in log)
- it looks like they stopped responding in moment when they has been shutdown by WAS because of inactivity and they never started again until iisreset or they have been stopped by website application error (one client had DB limit exceeded which caused his app to crash) -> so basically it doesn't matter what caused website to stop but after that app couldn't start again
As far as I can see there are no errors in Event Log System or Application except entries mentioned above. There is a big chance that most other websites where working just fine because they where not restarted because of being actively used or not crashing because of application errors. IIS logs just have gaps between moment when application stopped and iisreset command.
Does someone experienced similar issue or have any idea what could cause that problem?
Thanks