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Error: Basemap is not available. Displaying the default basemap instead

Error Message

In ArcGIS Online, opening a basemap returns the following error:

Error:   
Basemap is not available. Displaying the default basemap instead.
Image of the error message

Cause

The following are possible causes for this issue:

  • Certain web browsers and browser settings can prevent web sites with mixed content from drawing completely.
  • ArcGIS Online is referencing an incorrect tile layer URL. This can occur if the tile layer is deleted before being updated or if the name of the tile layer is changed.
  • Incorrect security settings. The organizations security settings use HTTPS, however the service URL for the basemap is referencing a HTTP URL.

Solution or Workaround

The following are possible workarounds for this issue.

  • Only use browsers supported by ArcGIS Online. The following ArcGIS Online document describes this in detail: Supported browsers
Note:
Ensure that Cross-Origin Resource Sharing (CORS) is enabled in the web browser. The instructions in the following page describe how to enable cross-origin requests in each browser: Cross-Origin Requests in Internet Explorer, Firefox, Safari and Chrome page
  • Use the ArcGIS Online Assistant to manually repair the service links of the updated tile layer. Replace the tile layer's service URL with the newly updated service URL.
  • Configure the ArcGIS Online security settings to allow HTTPS connections. The following ArcGIS Online document describes this in detail: Configure security settings
Note:
The ArcGIS Online Assistant can also be used to determine if mixed content is used by inspecting the web maps JSON. The following document explains the behavior of using mixed content in ArcGIS Online: Troubleshoot
Note:
Organizations can apply a domain filter to determine the domains that are allowed and restricted within the organization. The following document provides a list of URLs, which must be added into the organizations whitelist for ArcGIS Online to have full functionality: Domain Requirements for ArcGIS Online

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