Hi, how do I Configured active directory users and groups to synchronized automatically on 2 windows server 2008 R2, if one server down users and groups on that server can login other server (on 2 different WAN location) they are setup same domain name Mars.com Server1 IP: 202.154.120.250 Sub: 255.255.255.0 Gateway: 202.154.120.254 DNS1: 202.154.120.250 DNS2: 202.153.119.250 Server2 IP: 202.153.119.250 Sub: 255.255.255.0 Gateway: 202.153.119.254 DNS1: 202.153.119.250 DNS2: 202.154.120.250 Thank you in advance David