ArcGIS Field Maps: The server may not be responding or we encountered an unexpected error

Error Message

When logging in to ArcGIS Online or ArcGIS Enterprise through ArcGIS Field Maps on an Android device, the process fails and returns the following error:

Error:   
Connection error
The server may not be responding or we encountered an unexpected error

Cause

• The portal may only be accessible within the network (VPN). This would not be Android-specific.
• ArcGIS Field Maps may be corrupted and elements of the program broken, preventing it from running normally.
• ArcGIS Field Maps is not registered as an application in ArcGIS Enterprise.
• ArcGIS Field Maps is connected to a portal that uses Integrated Windows Authentication (IWA). IWA stops prompts for login, causing the app to fail to connect to the portal.

Solution or Workaround

Depending on the cause, the following workarounds are applicable.

Connect to the VPN on the device

A public ArcGIS Enterprise Portal is accessible from any network (can test accessing Portal home), while a restricted ArcGIS Enterprise Portal is not accessible from all networks. If the Portal is not publicly accessible, ensure the user's device is connected to the VPN when attempting to connect and log in to ArcGIS Enterprise Portal in ArcGIS Field Maps.

Uninstall and reinstall ArcGIS Field Maps

1. If there are unsaved edits, recover the offline edits. If not, move to Step 2. For detailed instructions to access offline edits from an Android device, refer to How To: Access offline edits from ArcGIS Field Maps directly from an Android device.
2. Uninstall Field Maps from the device.
3. Reinstall and start Field Maps on the device. It is now possible to log in to Field Maps via ArcGIS Online.

Register ArcGIS Field Maps as an application in ArcGIS Enterprise

Add ArcGIS Field Maps as a registered application to ArcGIS Enterprise. Refer to How To: Add the ArcGIS Field Maps mobile app as a registered application to ArcGIS Enterprise 10.6.1 or newer for further instructions.

Change the portal authentication type

Change the portal authentication type to portal-tier authentication. Refer to Portal for ArcGIS: Portal-tier authentication for instructions and more information.