MZ export fails in Select widget - Experience Builder Online with ArcGIS Enterprise layers (HTTP 500)

AndersonRincón — Wed, 11 Mar 2026 20:18:13 GMT

Hello community,

I have a public web application built in ArcGIS Experience Builder Online
(experience.arcgis.com) that uses layers hosted in ArcGIS Enterprise
(on-premises server). The app is public but the Enterprise layers are
protected/private.

ENVIRONMENT:
- Experience Builder: ArcGIS Online (experience.arcgis.com)
- ArcGIS Enterprise URL:
- Widget: Select widget with export functionality
- App access: Public (no login required)

PROBLEM:
When users try to export selected features to KMZ format using the
Select widget, the operation fails completely.

The browser console shows this error:
- HTTP Status: 500
- Message: "The connection attempt failed."
- Type: "request:server"
- URL failing: https://xyzxyzxyzx/server/rest/services/Hosted/PT_2021_2030/FeatureServer/93

IMPORTANT OBSERVATIONS:
1. Exporting to Shapefile works perfectly with the same layers
2. Exporting to KMZ fails with HTTP 500
3. The Print widget also had issues but was resolved by configuring
the Enterprise PrintingTools service URL in the widget settings
4. The Enterprise server has these GP services available and running:
- KMZToDownloadableFeature (Started)
- KMZToDownloadableFeature2 (Started)
- KMZtoKML (Started)
- ExtractData (Started)
- PrintingTools (Started)

QUESTION:
- Why does Shapefile export work but KMZ export fails?
- Does the Select widget use a specific GP service for KMZ export?
- Is there a way to configure the KMZ export service URL in the
Select widget (similar to how Print widget allows configuring
the print service URL)?
- Could this be a CORS or authentication issue between ArcGIS Online
and the Enterprise server?

Any help would be greatly appreciated. Thank you!

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MZ export fails in Select widget - Experience Builder Online with ArcGIS Enterprise layers (HTTP 500)