The sysvol permissions for one or more GPOs on this domain controller are not in sync with the permissions for the GPOs on the baseline domain - Microsoft Q&A
Understanding Group Policy Replication
FIX Group Policy Replication on SYSVOL & Non-Authoritative SYSVOL restore on DCS – 7 IT & Security
Active Directory Replication Time Intervals - Virtualization Howto
How to check if domain controllers are in sync with each other
Eddie's Blog: Configuring Windows Firewall Settings in Two GPOs May Corrupt the GPO
Repadmin: Check Active Directory Replication / Health
How to replicate a Domain Controller - V2 Cloud
PowerShell - Check the GPO Replication accross your domain - LazyWinAdmin
Force Replication From One Domain Controller To Another - The ICT Guy
Active Directory – driftar's Blog
How to enable strict replication consistency in AD | Yogesh