How To Fix /IWNGW/CM_HUB015 - An http error '&1' occured while getting metadata from external provider

/IWNGW/CM_HUB015 - Overview

• Message type: E = Error

• Message class: /IWNGW/CM_HUB -

• Message number: 015

• Message text: An http error '&1' occured while getting metadata from external provider

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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/IWNGW/CM_HUB015 - Details

• The SAP error message /IWNGW/CM_HUB015 indicates that there was an HTTP error while trying to retrieve metadata from an external provider. This error typically occurs in the context of SAP Gateway services when the system is trying to access an external service or API and encounters an issue.
  Causes:
  
  Network Issues: There may be connectivity problems between the SAP system and the external provider.
  Incorrect URL: The URL configured for the external provider may be incorrect or outdated.
  Authentication Issues: The external service may require authentication, and the credentials provided may be invalid or missing.
  Service Unavailability: The external service may be down or experiencing issues.
  Firewall/Proxy Issues: Firewalls or proxy settings may be blocking the request to the external provider.
  HTTP Status Codes: The error message may be accompanied by an HTTP status code (e.g., 404, 500) that can provide more context about the failure.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the SAP system can reach the external