How To Fix T2556 - RFC link & interrupted, no RFC back-up link available

SAP Error Message - Details

• Message type: E = Error

• Message class: T2 - General Treasury

• Message number: 556

• Message text: RFC link & interrupted, no RFC back-up link available

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message T2556 - RFC link & interrupted, no RFC back-up link available ?

  The SAP error message T2556, which states "RFC link & interrupted, no RFC back-up link available," typically indicates an issue with the Remote Function Call (RFC) connection between SAP systems. This error can occur due to various reasons, including network issues, configuration problems, or system resource limitations.
  Causes:
  
  Network Issues: Problems with the network connection between the SAP systems can lead to interruptions in the RFC link.
  Configuration Errors: Incorrect settings in the RFC destination configuration can cause the link to fail.
  System Resource Limitations: If the SAP system is under heavy load or if there are insufficient resources (like memory or CPU), it may not be able to maintain the RFC connection.
  Timeout Settings: If the timeout settings for the RFC connection are too low, it may lead to premature disconnections.
  Firewall or Security Settings: Firewalls or security settings may block the RFC communication between systems.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there is stable network connectivity between the SAP systems. You can use tools like ping or traceroute to diagnose network issues.
  Review RFC Destination Configuration: Go to transaction SM59 and check the configuration of the RFC destination. Ensure that the settings (like target host, system number, client, user, and password) are correct.
  Monitor System Resources: Use transaction SM50 or SM66 to monitor the workload on the SAP system. If the system is overloaded, consider optimizing performance or increasing resources.
  Adjust Timeout Settings: In transaction SM59, you can adjust the timeout settings for the RFC destination. Increasing the timeout may help prevent disconnections.
  Check Firewall Settings: Ensure that the necessary ports for RFC communication are open and that there are no firewall rules blocking the connection.
  Restart the RFC Connection: Sometimes, simply restarting the RFC connection can resolve temporary issues. You can do this in transaction SM59 by selecting the RFC destination and using the "Test Connection" option.
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: RFC Destinations (Display/Maintain)
  SM50: Work Process Overview
  SM66: Global Work Process Overview
  ST22: Dump Analysis (to check for any ABAP runtime errors)
  SMD1: Monitor RFC Connections
  
  
  
  SAP Notes: Check SAP Notes related to RFC issues for any specific patches or updates that may address known problems.
  
  
  Logs: Review system logs (transaction SM21) for any related error messages that could provide more context on the issue.
  
  
  If the problem 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.