Events View
Check event log in all DCs to find everything ok specifically DNS, system and Application events.
Dcdiag.exe
This is a must and will always tell you if there is trouble with DCs and/or services associated with it
Netdiag.exe
This will let me know if there are issues with the networking portion on the DC.
Netsh dhcp show server
This command identify DHCP in in AD infrastructure.
Repadmin /showreps
This shows all replication among DCs.
repadmin /replsum /errorsonly
This will identify any issues with replication among DCs.
Active Directory DNS Check
Dnslint /ad domain_controller_ip_address /s dns_server_ip_address
third-party tools
Manage Engine AD Manager Plus, Wise Soft Bulk user Admin, Solarwinds Engineer’s toolset, Active Directory Cleaner are very handy tools to monitor and manage Active Directory.
These are little things that give me peace of mind. I reckon “assume nothing, believe nothing, check everything…..” is the best way to prevent disaster.
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