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Check replication health between DCs
repadmin /replsummary
repadmin /showrepl * /csv > repl.csv
dcdiag /e /qWhy it works this way
Stalled replication means a password change never reaches another site, GPOs go stale, and eventually a DC dies.
Watch out
- Run it weekly, not only during incidents.
- Errors 1988/2042 are fix-now, not fix-tomorrow.