I think I found the problem. When I upgraded the server OS on Tuesday I had a 
second GUI login session open for the admin user as I needed to sudo to fix 
some permissions, etc (aka fast user switching). When I checked on the 
application early Saturday AM I realized I had left that user logged in with an 
idle terminal session. I also found that when I remotely logged in to to check 
on the 'web client' user that 4D was not running, but quickly launched (my 
login woke the system up). I suspect that power management features were 
causing the network and/or hard disks to 'sleep' at 3AM. We have not had 
problems since logging that user out. Therefore, even though you may think that 
Power Nap is configured to be off, it isn't totally.

Brad Perkins.

On 10/27/17, 3:02 PM, "Perkins, Bradley D" <bperk...@lanl.gov> wrote:

    I have grep'd everything in /var/log --- the files the the console displays 
-- and haven't found anything that is running at 3am. That is assuming of 
course that any system level activity would be logged. The closest entry is at 
3:01 and that is when my monitoring script emails me the first of many messages 
that there is a problem.
    
    I was mainly asking here in case those that are more in tune with current 
Mac goings on were aware of anything new in High Sierra that might have caused 
problems with 4D.
    
    I'm not familiar with the use of  4D's debug/request log. Can that be 
turned on easily, or do I have to recompile the structure to enable it?
    I'm mainly interested in what is going on at the client. I'd also guess 
that whatever is hanging 4D might not get logged to the server.
    
    Thanks,
    
    Brad
    
    > From: JBellos <jbel...@dvmax.com>
    
    > Try turning on the debug/request log in 4D to see what's firing in your
    > application at that time, if anything..
    
    > Also, look at the Mac Console log to see what's happening at 3 AM, if
    > there's anything unique running there that's not  happening earlier.

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