How To Fix GW459 - Communication system error; prepare failed

SAP Error Message - Details

• Message type: E = Error

• Message class: GW - Message Texts for Gateway

• Message number: 459

• Message text: Communication system error; prepare failed

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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Smart SAP Assistant

• What is the cause and solution for SAP error message GW459 - Communication system error; prepare failed ?

  The SAP error message GW459, which states "Communication system error; prepare failed," typically indicates an issue with the communication between the SAP system and an external system or service. This error can arise in various contexts, such as when using SAP Gateway, OData services, or when integrating with other systems.
  Causes:
  
  Network Issues: Problems with the network connection between the SAP system and the external service can lead to this error.
  Configuration Errors: Incorrect configuration settings in the SAP Gateway or the external system can cause communication failures.
  Service Availability: The external service or system may be down or unavailable, leading to a failure in communication.
  Authorization Issues: Lack of proper authorization for the user or service trying to access the external system can result in this error.
  Data Format Issues: If the data being sent or received does not conform to the expected format, it can lead to preparation failures.
  Timeouts: Long response times from the external service can lead to timeouts, causing the prepare phase to fail.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection between the SAP system and the external service is stable and functioning correctly.
  Review Configuration Settings: Verify the configuration settings in the SAP Gateway and the external system to ensure they are correct.
  Service Status: Check the status of the external service to ensure it is up and running. If it is down, you may need to wait until it is restored.
  Authorization Checks: Ensure that the user or service account has the necessary permissions to access the external system.
  Data Validation: Validate the data being sent or received to ensure it meets the expected format and requirements.
  Increase Timeout Settings: If timeouts are an issue, consider increasing the timeout settings in the SAP system or the external service.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error. SAP frequently updates its knowledge base with solutions for common problems.
  Transaction Codes: Use transaction codes like SLG1 (Application Log) to check for detailed logs related to the error, which can provide more context.
  Monitoring Tools: Utilize monitoring tools to track the performance and availability of the external services and the SAP Gateway.
  Debugging: If you have access, consider debugging the OData service or the relevant function module to identify the exact point of failure.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.