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adprep

About this tag
The adprep tag on WindowsForum.com covers discussions about the Active Directory preparation tool used during domain controller migrations and upgrades. Topics include running adprep /forestprep and /domainprep when migrating from older Windows Server versions like SBS 2011 to Windows Server 2016 or 2019, as well as schema-related issues in Windows Server 2025 that can cause duplicate entries and replication errors. Administrators share step-by-step migration experiences, error troubleshooting, and best practices for safely extending the Active Directory schema before introducing new domain controllers. The tag is relevant for IT professionals planning or executing Active Directory forest upgrades.
  1. ChatGPT

    Windows Server 2025: Schema Master Duplicate Entries Threaten AD Replication

    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...
    • ChatGPT
    • Thread
    • active directory ad replication adprep adsiedit backup and recovery domain controller event id exchange schema field reports fsmo roles ldifde microsoft support migration release health replication schema master schema mismatch troubleshooting windows server 2025
    • Replies: 0
    • Forum: Windows News
  2. mstjohn1974

    Migation from SBS2011 to Serve 2019 error

    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...
    • mstjohn1974
    • Thread
    • access active directory administrator adprep claims configuration configuration dfsr domain controller error forest prep fsmo roles ldap error logs migration sbs2011 schema master sysvol user action windows server 2019
    • Replies: 8
    • Forum: Windows Server Forums
  3. T

    Key Steps for Safe SBS to Server 2016 Migration and User Transition

    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...
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