How To Fix OPP_CORE004 - Error code &2 when connecting to RFC destination &1

SAP Error Message - Details

• Message type: E = Error

• Message class: OPP_CORE - Messages for OPP core functionality

• Message number: 004

• Message text: Error code &2 when connecting 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 OPP_CORE004 - Error code &2 when connecting to RFC destination &1 ?

  The SAP error message OPP_CORE004 with error code &2 when connecting to RFC destination &1 typically indicates an issue with the connection to the specified RFC destination. This error can arise due to various reasons, including configuration issues, network problems, or authorization issues. Here’s a breakdown of the potential causes, solutions, and related information:
  Causes:
  
  Incorrect RFC Destination Configuration: The RFC destination may not be configured correctly in the SAP system.
  Network Issues: There may be network connectivity problems between the SAP systems.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  SAP Gateway Issues: The SAP Gateway service may not be running or may be misconfigured.
  Firewall Restrictions: Firewalls may be blocking the connection to the RFC destination.
  System Availability: The target system may be down or not reachable.
  
  Solutions:
  
  
  Check RFC Destination Configuration:
  
  Go to transaction SM59 and verify the settings for the RFC destination &1.
  Ensure that the connection type is correct (e.g., TCP/IP, TCP/IP with encryption).
  Test the connection using the "Connection Test" button in SM59.
  
  
  
  Verify 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.
  
  
  
  Check User Authorizations:
  
  Ensure that the user credentials used for the RFC connection have the necessary authorizations to access the target system.
  Check the user roles and profiles in transaction SU01.
  
  
  
  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.
  
  
  
  Firewall Configuration:
  
  Check if there are any firewall rules that might be blocking the connection to the RFC destination.
  Ensure that the necessary ports are open for communication.
  
  
  
  System Availability:
  
  Verify that the target system is up and running.
  Check for any system maintenance or downtime that might affect connectivity.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: RFC Destination Configuration
  SU01: User Maintenance
  SMGW: SAP Gateway Monitor
  ST22: Dump Analysis (to check for any runtime errors)
  
  
  
  SAP Notes: Check SAP Notes related to RFC connection issues for any specific patches or updates that may address known issues.
  
  
  Logs: Review the system logs in transaction SM21 for any additional error messages that may provide more context about the issue.
  
  
  By following these steps, you should be able to diagnose and resolve the OPP_CORE004 error when connecting to the specified RFC destination. If the issue persists, consider reaching out to your SAP Basis team or SAP support for further assistance.