How To Fix IRW_LT037 - RFC connection &1 to legacy system failed (see long text)

SAP Error Message - Details

• Message type: E = Error

• Message class: IRW_LT - ILM LT

• Message number: 037

• Message text: RFC connection &1 to legacy system failed (see long text)

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

For an SAP legacy system, a trusted RFC connection from this system to
corresponding legacy system is required to get table's field description
and so on.

How to fix this error?

Go to transaction SM59 and test if the RFC configuration &V1& maintained
is working fine.
<ZH>Note</>: The maintained RFC should be a trusted connection.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message IRW_LT037 - RFC connection &1 to legacy system failed (see long text) ?

  The SAP error message IRW_LT037 indicates that there is a failure in the RFC (Remote Function Call) connection to a legacy system. This error typically arises when SAP is trying to communicate with an external system, and the connection cannot be established for various reasons.
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the legacy system.
  Configuration Errors: The RFC destination may not be configured correctly in the SAP system.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary permissions.
  Legacy System Down: The legacy system may be down or not reachable.
  Firewall Restrictions: Firewalls may be blocking the connection between the SAP system and the legacy system.
  Incorrect Parameters: The parameters set in the RFC destination (like IP address, port, etc.) may be incorrect.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or telnet to check if the legacy system is reachable from the SAP server.
  
  
  
  Verify RFC Destination Configuration:
  
  Go to transaction SM59 in SAP and check the configuration of the RFC destination. Ensure that the connection type, target host, and service number are correct.
  
  
  
  Test the RFC Connection:
  
  In transaction SM59, select the RFC destination and use the "Test Connection" option to see if the connection can be established successfully.
  
  
  
  Check User Authorizations:
  
  Ensure that the user credentials used for the RFC connection have the necessary authorizations to access the legacy system.
  
  
  
  Check Legacy System Status:
  
  Verify that the legacy system is up and running and can accept connections.
  
  
  
  Review Firewall Settings:
  
  Check if there are any firewall rules that might be blocking the connection between the SAP system and the legacy system.
  
  
  
  Review Logs:
  
  Check the SAP system logs (transaction SM21) and the application logs for any additional error messages that might provide more context.
  
  
  
  Related Information:
  
  RFC Connection Types: Understand the different types of RFC connections (e.g., T, 3, etc.) and ensure the correct type is used for the legacy system.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that might address specific issues related to RFC connections.
  Documentation: Review the documentation for both the SAP system and the legacy system to ensure compatibility and correct configuration.
  
  If the issue persists after checking the above points, it may be necessary to involve your network or system administrator for further investigation.