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I had the same problem, my issue was that the outside interface https was NATted, changed the ASDM port (duh). Only one result with the phrase "Failed to start admin listener" so I guess I'll leave this here.
Did you figure this out? I have the same question and I am a Google ninja but see nothing on why my 2012 servers are showing as Windows 7. We are on 6.0.1.1-1023 btw.
