I am very new to Windows Server, so sorry for dummy questions. I have a Windows Server 2008 R2 Enterprise. There are few AppPools. The problem is, that DefaultAppPool stops responding after 40 users online (depending on loadimpact tests).
Strange thing is that when I do a load test on websites configured on TestPool or Test2Pool (different domains, different websites and databases than DefaultAppPool), DefaultAppPool website hangs, while TestPool website is ok.
This load test has no impact on server's cpu or memory usage. I have tried monitoring HTTP Service Request Queues and W3SVC_W3WP variables with Performance monitor, but with no signs of strange things. Also checked Connection limits - it's default value.
How could I track this issue?