I am noticing that when my exchange 2010 servers are discovering domain controllers all of them are found except for DC's in one state. All of my california DC's are not being found. We have 3 AD sites in CA (LAX, SFO, and IRV) and none of those DC's show up in my event 2080 as being out of site DC's. Its not an error or even a warning, just those DC's do not show up in the list. Any ideas on what to troubleshoot here?