since it is at the same time -
There are a couple of possibilities:
- anti virus software (either update, or scan)
- cron job - specifically the daily 'cleanup' routines run by OS X
- some other specific timed action setup by(?) IT, the end user(s)?

Chip

On Fri, 27 Oct 2017 16:22:36 +0000, Perkins, Bradley D via 4D_Tech 
wrote:
> We had to update a machine to Mac OS X Hi Sierra this week 
> (cybersecurity mandate) on Tuesday of this week.
> This machine runs as a web 'client' on 4D 15.4.
> I have long standing controls in place to monitor the 4D application 
> and keep it running.
> Since the OS update, 4D is hanging at 3am every morning and is not 
> recovering. I know this because my scripts are sending me email every 
> 3 minutes that there is a problem. I have to manually reboot 4D every 
> morning.
> 
> From what I can tell Power Nap is off on the machine:
> 
> $ pmset -g
> System-wide power settings:
> Currently in use:
> standby              1
> Sleep On Power Button 1
> womp                 1
> autorestart          1
> hibernatefile        /var/vm/sleepimage
> powernap             0
> gpuswitch            2
> networkoversleep     0
> disksleep            0
> sleep                0 (sleep prevented by screensharingd)
> autopoweroffdelay    28800
> hibernatemode        0
> autopoweroff         1
> ttyskeepawake        1
> displaysleep         30
> standbydelay         10800
> I have an external job that runs at 3am via launchd, but turned it 
> off yesterday to see if it was causing the problem. We still had the 
> problem this morning. I can also run that job manually while 4D is 
> running and it doesn't cause problems.
> When I accessed 4D this morning to reboot, I briefly saw a 4D error 
> dialog that would make me think the source of the problem is in a 
> 4Dprocess that writes a file to disk. That process is running now 
> without problem. Unfortunately the dialog dismissed itself before I 
> could write down details. Therefore, I suspect something is running 
> at ~3 that is not letting 4D write that file.
> 
> I've dug through logs and looked at other system settings to see if 
> the system is running something at that time, but haven't found 
> anything.
> 
> Any ideas would be appreciated?
> 
> -- Brad
> 
> 
> 
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