My mac mini will go back to sleep mode just after a Wake on WAN

Hi,
I am trying to find the correct setting in order to keep my mac mini woken up after sending a magic packet relayed by my router. My mac is connected via USB to a Drobo Mini which provides external storage capacity.
Basically what happens is the following  :
- I wake up my mac via wakeonwan.fr for example
- I get access to my mac for 1 minute (tops)
- I loose access to my mac and I have to wake it up again (typically internal web server pages are not displayed anymore after 1mn)
Configured settings (in the energy saving panel) :
- Idle time before sleep : 15mn
- No HDD stop in case of inactivity
- Wake on LAN activated
In case I configure my mac not to sleep in the energy saving panel, everything works fine, but the goal here would be to save energy from my Mac + NAS and to preserve the use of the HDDs.
Would there be any monitoring commands / hidden threads that could help me know which process is forcing my mac to cut the WAN access / sleep without notice?
Thank you,
Sowdah

Hello Sowdah,
See if it's related to this...
It also seems to be related to later OSX versions, like 10.8.x & 10.9.x
The 2012 macs (and later apparently) (also later OSX versions on earlier Macs can do it also), not waking normally from sleep after hours being in sleep. (noted here ...
http://www.xlr8yourmac.com/archives/feb13/022813.html#2012macswontwake
"Why 2012 iMac/2012 Mac Mini won't Wake After Hours of Sleep (Hibernates/Powers Off)")
The sleepimage file still reappears even if never slept. Delete it (hibernate off, etc) - within minutes its back.
A note on that here - http://www.xlr8yourmac.com/feedback/Chameleon_SSD_Optimizer.html
About iMac sleep...
http://forums.macrumors.com/showthread.php?t=1529750
Try this: "sudo pmset autopoweroff 0" and "sudo pmset standby 0"
http://xlr8yourmac.com/archives/sep13/091313.html#10.8.5SleepEjectTip

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