Unable to authenticate with ArcGIS API for Python when using 'GIS Server' as Authentication Tier and 'Windows Domain' as User Store.

Workaround

There are two options:

1. Configure with IWA (for IIS settings, Anonymous has to be disabled and Windows Authentication has to be enabled).
2. Set the User Store = Built-in and keep the Authentication Tier = GIS Server. There are no issues authenticating built-in users.

1)

When IWA is configured, authentication succeeds using ArcGIS API for Python. Secured Services list when accessing Rest Services in the browser & listing out the secured services using the ArcGIS API for Python.

• Server security settings:
  • 
• IIS Authentication Settings (Anonymous has to be disabled and Windows Authentication has to be enabled):
  • 
• List out services while connected to the server URL through the web adaptor. Note the Polygon_New services are listing (these are secured services).
  • 

2) With User Store = ArcGIS Server Built-in, there are no issues authenticating and the secured services list when accessing Rest Services in the browser and when listing using Python.

• Server security settings:
  • 
• List out services while connected to the server URL through the web adaptor. Note the Polygon_New services are listing (these are secured services).
  • 

Steps to Reproduce