I have recently inherited a client that has a mixed environment.
They have 2 locations connected by a IPSEC VPN.
2 IBM Windows Server 2008 r2 mirrored in each location with six 2008+ iMac's in one location and 4 in the other.
In each of the locations we cannot log onto the network on 2 machines. We can log on using local admin accounts; access the internet and low security shared resources. I can even log in via remote desktop to the servers.
I found that the clocks on the iMac's are about 5-6 minutes slower than the server. Looking at this I thought this possibly was the cause with Active Directory not authenticating the machines.
I have looked at the servers time server and it is time.microsoft.com and when I try to amend the ntp.conf file on the iMac's to represent this and have them sync up nothing changes.
I have been working on this for a few days and am really banging my head against a wall now.
Any ideas would be greatly appreciated.