When an object is changed on a given domain controller – let’s say a server named DC1 – the USN is iterated which tells DC1 a change needs to be replicated to its replication partners. Let’s use the example of two DC’s that are replication partners. Put simply, USN’s are how Active Directory keeps track of replication. If you aren’t familiar with USN rollback, in this post we’ll give you a better idea of what it is, helping ruling it in or out, and how to fix it when it does happen.įirst let’s define a USN. One of the scenarios we’ve seen a fair amount of here in support is when this happens following the restoration of a physical or virtual DC resulting in a state called USN rollback. No inbound replication, no outbound replication, not one Naming Context coming or going. It’s particularly confounding when a DC just won’t replicate….anything….whatsoever. As many of us know, Active Directory replication problems come in all shapes and sizes.
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