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In ArcGIS Online, opening a basemap returns the following error:
Error: Basemap is not available. Displaying the default basemap instead.
The following are possible causes for this issue:
The following are possible workarounds for this issue.
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
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