How To Fix URL_GEN_MSGS018 - RFC connection to logical system &1 could not be set up

SAP Error Message - Details

• Message type: E = Error

• Message class: URL_GEN_MSGS - Messages for URL Generation

• Message number: 018

• Message text: RFC connection to logical system &1 could not be set up

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 URL_GEN_MSGS018 - RFC connection to logical system &1 could not be set up ?

  The SAP error message URL_GEN_MSGS018 indicates that there is an issue with establishing an RFC (Remote Function Call) connection to a specified logical system. This error can occur due to various reasons, and here are some common causes, solutions, and related information:
  Causes:
  
  Incorrect Configuration: The RFC destination may not be configured correctly in the SAP system.
  Network Issues: There may be network connectivity issues between the SAP systems.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  Logical System Not Defined: The logical system you are trying to connect to may not be defined in the SAP system.
  SAP Gateway Issues: The SAP Gateway service may not be running or may be misconfigured.
  Firewall Restrictions: Firewalls may be blocking the required ports for RFC communication.
  
  Solutions:
  
  
  Check RFC Destination Configuration:
  
  Go to transaction SM59 and check the configuration of the RFC destination.
  Ensure that the connection type is correct (e.g., T for TCP/IP connections).
  Test the connection using the "Test Connection" button.
  
  
  
  Verify Logical System Definition:
  
  Ensure that the logical system is defined in transaction SALE (for ALE/IDoc settings) or SPRO (for general configuration).
  Check if the logical system is correctly assigned to the client.
  
  
  
  Check Network Connectivity:
  
  Use tools like ping or telnet to check if the target system is reachable from the source system.
  Ensure that the hostname and port number are correct in the RFC destination.
  
  
  
  Review User 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 is running. You can check this using transaction SMGW.
  Look for any errors or issues in the gateway logs.
  
  
  
  Firewall Configuration:
  
  Check if there are any firewall rules that might be blocking the communication between the two systems.
  Ensure that the necessary ports (usually 3200 for SAP) are open.
  
  
  
  Review Logs:
  
  Check the system logs (transaction SM21) and the developer trace (transaction ST22) for any additional error messages that might provide more context.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: RFC Destinations
  SALE: Logical System Configuration
  SMGW: SAP Gateway Monitor
  SM21: System Log
  ST22: Dump Analysis
  
  
  
  Documentation: Refer to SAP Help documentation for more details on RFC connections and troubleshooting.
  
  
  By following these steps, you should be able to identify and resolve the issue causing the URL_GEN_MSGS018 error. If the problem persists, consider reaching out to your SAP Basis team or SAP support for further assistance.