Need help please. We have 3 x 2008r2 domain controllers. We've been fighting with some unusually slow domain logins and other flakiness for a while. For example navigating between OUs in active directory users and computers is painfully slow. While testing basic connectivity, I found that a ipv6 ping to one of our domain controllers fails, but here is the interesting part. If I ping -6 from domain controller to my workstation, then for a couple minutes, ping -6 from my workstation to the domain controller works. After just about 2 minutes, it begins failing again when I ping workstation to server. Destination host unreachable is the error. Ping -6 from my workstation to all other servers and domain controllers work fine. I checked the windows firewall on the failing computer and it looks identical to the other 2 domain controllers. One point that may be relevant. The failing DC has 2 nics. I did try disabling one of the nics and rebooting. No help. Turned windows firewall off, no help. Any suggestions appreciated.
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