For the last 3 days at approximately the same time each day we have been receiving "Server Load Is Very High" notifications emails and upon checking the CPU load and Memory usage at that point they are both very high.
CPU load goes into the red zone and the Memory shows very little free. End users start having problems accessing websites, remote users start having problems connecting, and access to the main Untangle overview screen takes a long time to load.
After about 30 minutes the CPU and Memory load settles back down to normal levels and everything is fine again.
Under normal day to day usage Memory sits at around 50-60% and CPU load is almost at zero.
The main thing we've noticed is that when the problems occur it is roughly the same time each day (10:19AM on the first day, 10:26AM on the second day and 11:09AM on the third day).
The sessions per minute at the times of the problem are not excessive and are actually a lot less than at other times during the day.
We haven't made any changes at all and these problems only started happening on Tuesday.
We're running Untangle on an (admitedly older) Dell Vostro box with a Quad Core processor and 4GB but up until this week we have had zero problems with Untangle in all the time we've had it. 65 users in total.
It seems that something on Untangle might be triggering at roughly the same time each day but as we've not made any changes at all we're not sure what this could be.
I was wondering if anyone had any ideas of what might be causing this?
Thanks in advance