How To Fix /SAPTRX/ERRMSG021 - Communication failure

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPTRX/ERRMSG -

• Message number: 021

• Message text: Communication failure

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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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPTRX/ERRMSG021 - Communication failure ?

  The SAP error message /SAPTRX/ERRMSG021 Communication failure typically indicates a communication issue between the SAP system and an external system or service. This could be due to various reasons, including network issues, configuration problems, or service unavailability.
  Causes:
  
  Network Issues: Problems with the network connection between the SAP system and the external system can lead to communication failures.
  Service Unavailability: The external service or system that SAP is trying to communicate with may be down or not reachable.
  Configuration Errors: Incorrect configuration settings in the SAP system or the external system can prevent successful communication.
  Firewall or Security Settings: Firewalls or security settings may block the communication between the systems.
  Timeouts: If the response from the external system takes too long, it may result in a timeout error.
  Incorrect Credentials: If the communication requires authentication, incorrect credentials can lead to failure.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection between the SAP system and the external system is stable and functioning properly. You can use tools like ping or traceroute to diagnose network issues.
  Verify External Service Status: Check if the external service or system is up and running. If it is down, you may need to wait until it is restored.
  Review Configuration Settings: Double-check the configuration settings in both the SAP system and the external system to ensure they are correct. This includes checking URLs, ports, and any other relevant parameters.
  Examine Firewall Rules: Ensure that firewall settings allow communication between the SAP system and the external service. You may need to work with your network/security team to adjust these settings.
  Increase Timeout Settings: If timeouts are an issue, consider increasing the timeout settings in the SAP system or the external service.
  Check Authentication Credentials: If the communication requires authentication, verify that the credentials being used are correct and have the necessary permissions.
  
  Related Information:
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  Logs and Traces: Review the application logs and traces in the SAP system for more detailed error messages that can provide insights into the root cause of the communication failure.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  
  If the issue persists after trying the above solutions, it may be beneficial to involve your SAP Basis team or SAP support for further assistance.