How To Fix /IWNGW/CM_HUB016 - RFC Error: Communication failure

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWNGW/CM_HUB -

• Message number: 016

• Message text: RFC Error: Communication failure

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWNGW/CM_HUB016 - RFC Error: Communication failure ?

  The SAP error message /IWNGW/CM_HUB016 RFC Error: Communication failure typically indicates a problem with the Remote Function Call (RFC) communication between SAP systems or between an SAP system and an external system. This error can arise due to various reasons, including network issues, configuration problems, or system downtime.
  Causes:
  
  Network Issues: Problems with the network connection, such as firewalls blocking the communication, DNS resolution issues, or network outages.
  RFC Destination Configuration: Incorrect configuration of the RFC destination in the SAP system (e.g., incorrect IP address, port number, or user credentials).
  System Downtime: The target system may be down or not reachable due to maintenance or other issues.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  SAP Gateway Issues: Problems with the SAP Gateway service, which is responsible for handling RFC calls.
  Timeout Settings: The timeout settings for the RFC connection may be too short, causing the connection to fail before it can be established.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection between the systems is stable. You can use tools like ping or traceroute to diagnose connectivity issues.
  Verify RFC Destination: Go to transaction SM59 in the SAP GUI and check the configuration of the RFC destination. Ensure that the connection parameters (like host, service, and user credentials) are correct.
  Check System Status: Verify that the target system is up and running. You can check the system logs or use transaction SM51 to see the status of application servers.
  Review Authorizations: Ensure that the user credentials used for the RFC connection have the necessary authorizations to perform the required actions.
  Check SAP Gateway: Ensure that the SAP Gateway service is running properly. You can check the status of the gateway using transaction SMGW.
  Adjust Timeout Settings: If the timeout settings are too short, consider increasing them in the RFC destination settings.
  Review Logs: Check the system logs (transaction SM21) and the developer traces (transaction ST22) for any additional error messages that might provide more context.
  
  Related Information:
  
  Transaction Codes:
  
  SM59: RFC Destination Configuration
  SMGW: SAP Gateway Monitor
  SM21: System Log
  ST22: Dump Analysis
  SM51: List of Active Application Servers
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to RFC communication failures.
  Documentation: Review SAP documentation on RFC communication and troubleshooting for more detailed guidance.
  
  If the issue persists after checking these areas, it may be beneficial to involve your SAP Basis team or consult SAP support for further assistance.