I replaced the one .dll and one .pdb file in the bin folder and it caused the site down as I described in the previous message. I then reverted back the two files and the site is up again. I checked the event log and found below message:
Message: Change Notification for critical directories.
bin dir change or directory rename
HostingEnvironment initiated shutdown
Change Notification for critical directories.
bin dir change or directory rename
Change Notification for critical directories.
bin dir change or directory rename
HostingEnvironment caused shutdown
Any idea why it's causing the shutdown?
thanks