In late 2010 OpenBSD experienced something similar.It is interesting to look at the details of that case. Awful lot of connections but apparently nothing big came of it or so they all say.
http://marc.info/?l=openbsd-tech&m=129236621626462&w=2 A few days later... http://lwn.net/Articles/420858/I'm not sure what I believe, but I can say that this type of thing introduces distrust which takes more time and energy to overcome or to verify.
