Thank you very much for your quick response. Unfortunately I was unable to reply as quick as you have. So here we go:
Oct 24 21:31:10 kernel[0] <Notice>: Wake reason: RTC (Alarm)
Oct 24 21:31:10 kernel[0] <Notice>: AppleThunderboltGenericHAL::earlyWake - complete - took 1 milliseconds
Oct 24 23:20:02 kernel[0] <Notice>: Wake reason: RTC (Alarm)
Oct 24 23:20:02 kernel[0] <Notice>: AppleThunderboltGenericHAL::earlyWake - complete - took 1 milliseconds
Oct 25 01:08:58 kernel[0] <Notice>: Wake reason: RTC (Alarm)
Oct 25 01:08:58 kernel[0] <Notice>: AppleThunderboltGenericHAL::earlyWake - complete - took 1 milliseconds
Oct 25 01:09:57 kernel[0] <Notice>: Wake reason: RTC (Alarm)
Oct 25 02:57:54 kernel[0] <Notice>: AppleThunderboltGenericHAL::earlyWake - complete - took 1 milliseconds
Oct 25 04:46:46 kernel[0] <Notice>: Wake reason: RTC (Alarm)
Oct 25 04:46:46 kernel[0] <Notice>: AppleThunderboltGenericHAL::earlyWake - complete - took 1 milliseconds
Oct 25 04:48:22 kernel[0] <Notice>: Wake reason: EHC2
Oct 25 04:48:22 kernel[0] <Notice>: The USB device HubDevice (Port 1 of Hub at 0xfa000000) may have caused a wake by issuing a remote wakeup (2)
Oct 25 04:48:22 kernel[0] <Notice>: AppleThunderboltGenericHAL::earlyWake - complete - took 1 milliseconds
Oct 25 04:48:22 kernel[0] <Notice>: The USB device Keyboard Hub (Port 2 of Hub at 0xfa100000) may have caused a wake by issuing a remote wakeup (3)
Oct 25 04:48:22 kernel[0] <Notice>: The USB device Apple Keyboard (Port 2 of Hub at 0xfa120000) may have caused a wake by issuing a remote wakeup (3)
Oct 25 04:48:22 kernel[0] <Notice>: full wake promotion (reason 1) 146 ms
This is the output you told me to generate. I am no specialist concerning Macs, so could you please tell me what to make of it?
I am not very proud to admit that I am a computer scientist myself, but the Mac is simply my workhorse, and I had no real reason until now to make me familiar with its internal workings. That is exactly the reason I bought it for. Now things seem to change however...
Btw, there is no peripheral attached to the Thunderbolt port. I have a Fritz!Box which might call out on WLAN, and there is an Apple TV also, but the settings should let the iMac ignore their calls.
And I don't want to switch off Multicast, if you want to suggest so... 😉