Active Directory DHCP Authorisation Issues

So you just deleted a DHCP server in your Active Directory site and can’t authorise a new one? Yeah… Stupid.

A client of mine recently deleted a Windows Server running DHCP and couldn’t authorise the new server of the same name.
This is because the client did not Unauthorise the server beforehand. Possibly because the server hardware was dead.

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[Snippet] Checking a Global Catalog is really a Global Catalog

Use an LDAP browser or ADSI Editor to connect to the port 3268 Global Catalog communication is performed over TCP port 3268, regular LDAP lookups are sent to TCP port 389.

After assigning a GC role to a server, check its Directory Services event log for event number 1119, which indicates successful obtaining a role of a Global Catalog server