π ~2 min read
Table of contents
Symptom & Impact
On Windows Server 2019 domain controllers and member servers, folder redirection GPO failure blocks user authentication, group policy processing, or directory access. The impact ranges from single-user lockouts to forest-wide replication and trust failures, and remediation must follow change-control because identity is foundational to every dependent service.
Environment & Reproduction
The issue reproduces on Windows Server 2019 domain controllers running the ActiveDirectory PowerShell module, typically after group changes, GPO edits, migrations, or replication interruptions. Validate on a lab DC promoted into a forest functional level of 2016 or higher, and capture state before changes.
Get-ADDomain | Select Name,DomainMode,Forest
Get-ADDomainController -Filter * | Select HostName,OperatingSystem
Root Cause Analysis
The defect stems from folder redirection GPO failure where AD attributes, group memberships, policy precedence, or replication metadata diverge from the intended state. Common contributors include stale Kerberos tickets, oversized tokens, broken trust relationships, GPO targeting errors, and unresolved tombstone or SID conflicts after migration.
Quick Triage
Capture the failing user or computer object state, the relevant security event, and the resultant policy before applying changes. Snapshot replication health with repadmin and confirm time sync across DCs because Kerberos depends on a five-minute clock skew window.
repadmin /replsummary
w32tm /monitor
Step-by-Step Diagnosis
Walk the identity stack from the user object, through group membership and PSO precedence, to the authenticating DC and DNS resolver, collecting evidence for folder redirection GPO failure at each hop.
gpresult /h C:Tempgp.html
Get-WinEvent -LogName 'Microsoft-Windows-Folder Redirection/Operational' -MaxEvents 20

Solution β Primary Fix
Apply the targeted remediation below to restore expected behaviour for folder redirection GPO failure, then trigger replication and gpupdate so the change propagates across the domain.
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# Verify share permissions Everyone Full and NTFS user-specific; enable offline files
Get-SmbShare ProfileShare | Select Name,Path
icacls '\fs01redirect$' /grant 'Authenticated Users:(CI)(M)'

Solution β Alternative Approaches
Where the primary fix is blocked by change control, downtime windows, or licence limitations, the alternative path below achieves the same outcome via UI tools, scripted bulk operations, or staged group rollout.
# Use 'Grant the user exclusive rights' off if inheritance is needed for admins
Verification & Acceptance Criteria
Confirm the user, group, or trust now reports the expected state and that a representative authentication or access operation succeeds end-to-end against the affected workload.
Get-WinEvent -LogName 'Microsoft-Windows-Folder Redirection/Operational' -MaxEvents 5 | Where Id -eq 502
Rollback Plan
If the change introduces regressions, restore the pre-change attributes from AD Recycle Bin, authoritative restore, or the documented backup, then force replication so the rollback is consistent across DCs.
# Re-link prior GPO and run gpupdate /force on affected workstations
Prevention & Hardening
Codify the validated identity baseline in Group Policy, fine-grained password policies, and AD delegation templates, and add scheduled health checks via repadmin, dcdiag, and AAD Connect Health where applicable.
# Centralise redirection settings in a dedicated GPO scoped by security group
Related Errors & Cross-Refs
Related: Kerberos KRB_AP_ERR_MODIFIED, NTLM fallback warnings, GPO event 1085, AD replication events 1864/2042, AAD Connect export errors, and trust authentication failures in the Security and Directory Service logs.
Related tutorial: View the step-by-step tutorial for Windows Server 2019.
View all Windows Server 2019 tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Microsoft Learn: Active Directory Domain Services on Windows Server 2019, AD Recycle Bin, Fine-Grained Password Policies, AAD Connect, AGDLP, FSMO roles, and the official AD Forest Recovery Guide.
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