Thanks this is useful. I am talking older firmware updates - all our machines are old :( - and I am seeing the endless loop problem because the firmware update never runs so people are stuck with Munki never updating.
I removed our Software Update Server, but actually it is killing our bandwidth having all machines do their own updates from Apple so I may reinstate it as it will give me a good solution to this problem. Think I will look at Reposado too since I could put that on Linux box.
Thanks for the info. Any more ideas and experiences gratefully received.