How To Fix /SAPTRX/ASC104 - Communication failure to RFC destination &1

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPTRX/ASC -

• Message number: 104

• Message text: Communication failure to RFC destination &1

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPTRX/ASC104 - Communication failure to RFC destination &1 ?

  The SAP error message /SAPTRX/ASC104 Communication failure to RFC destination &1 indicates that there is a communication issue with the specified RFC (Remote Function Call) destination in your SAP system. This error can occur for various reasons, and here are some common causes, solutions, and related information:
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the target system defined in the RFC destination.
  Incorrect RFC Destination Configuration: The RFC destination may be incorrectly configured, including wrong hostnames, IP addresses, or ports.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to access the target system.
  Target System Down: The target system may be down or not reachable due to maintenance or other issues.
  Firewall Restrictions: Firewalls may be blocking the communication between the two systems.
  SAP Gateway Issues: The SAP Gateway service may not be running or may be misconfigured.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or telnet to check if the target system is reachable from the SAP system.
  Ensure that there are no network outages or issues.
  
  
  
  Verify RFC Destination Configuration:
  
  Go to transaction SM59 in the SAP GUI.
  Locate the RFC destination that is causing the issue and check its configuration settings (e.g., target host, system number, client, user, and password).
  Test the connection using the "Connection Test" button in SM59.
  
  
  
  Check User Authorizations:
  
  Ensure that the user credentials used in the RFC destination have the necessary authorizations to access the target system.
  Check the user’s roles and profiles in transaction SU01.
  
  
  
  Check Target System Status:
  
  Verify that the target system is up and running.
  If the target system is down, coordinate with the relevant team to bring it back online.
  
  
  
  Review Firewall Settings:
  
  Ensure that the necessary ports for RFC communication are open in the firewall settings.
  Consult with your network/security team if needed.
  
  
  
  Check SAP Gateway:
  
  Ensure that the SAP Gateway service is running on both the source and target systems.
  You can check the status of the gateway using transaction SMGW.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: Manage RFC Destinations
  SU01: User Maintenance
  SMGW: Gateway Monitor
  SICF: HTTP Service Hierarchy Maintenance (for web services)
  
  
  
  Logs and Traces:
  
  Check the system logs (transaction SM21) for any related error messages.
  Use transaction ST22 to check for dumps that may provide more context on the error.
  
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to RFC communication failures.
  
  
  By following these steps, you should be able to diagnose and resolve the communication failure indicated by the error message /SAPTRX/ASC104.