A subtle but dangerous bug in Windows Server 2025’s Schema Master FSMO role is causing duplicate schema entries that can break Active Directory replication and trigger schema-mismatch errors on older domain controllers — the issue is being discussed by administrators and reported in the field...
active directory
ad replication
adprep
adsiedit
backup and recovery
domain controllers
event id 1203
exchange schema
field reports
fsmo roles
ldifde
microsoft support
migration planning
release health
replication issues
schema master
schema mismatch
troubleshooting
windows server 2025
I am in the middle of a Server Migration from an SBS2011 Server to a Windows Server 2019. During the step of running ADPREP.EXE /ForestPrep I am encountering the following error:
C:\ADPrep\adprep>adprep /forestprep
ADPREP WARNING:
Before running adprep, all Windows Active Directory Domain...
Hi Guys
I’m doing my first solo migration (sbs to server 2016). I’ve seen it done a while back and half been involved so I just need some clarification.
Of course there are guides online to follow which ill do, however they don’t specify one key thing - at which point does the old server in my...