An Azure service that provides a hybrid, multi-cloud management platform for APIs.
@Krishnan Thanks for reaching out. When an administrator accesses the new developer portal, the user's browser makes a GET call to https://ManagementEndpointHostname/subscriptions/xxx/resourceGroups/xxx/providers/Microsoft.ApiManagement/service/xxx/contentTypes/document/contentItems/configuration?api-version=2018-06-01-preview
This error is reported when a request to the above mentioned management endpoint fails. could you please confirm if you're using a custom domain for the management endpoint? If yes please ensure you're using a valid ssl certificate that is supported by a browser.