We have several remote sites and 1 site in particular only has 1 2003 domain controller. This domain controller went down and users were not able to authenticate. In active directory sites and services this Site only has this 1 DC listed there. Replication is setup and is working as it is connected to one of our other domain controllers. My question is what is best practice to setup up redundancy for authentication. Is this failing because we only have 1 DC in this remote site listing? Is there an alternative to actually adding a second DC in this site?