Esri recommends using aGroup Managed Service Account (gMSA)to run Portal for ArcGIS services in Windows environments. gMSAsautomatically manage passwords, align withActive Directory policies, and areideal for enterprise-scale deployments.
From Esri documentation:
“Using a group managed service account (gMSA) to run Portal for ArcGIS services improves security by allowing Windows to manage the password, reducing administrative overhead while meeting enterprise security requirements.”
OptionB(regular AD account) is acceptable butrequires manual password updates.
OptionCandDare not secure or scalable for enterprise environments.
[Reference:ArcGIS Enterprise –Service Account Recommendations for Windows Environments, =====================]
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