How To Fix /SMB/MD_AS_CUST026 - RFC Connection for client &1 not defined

SAP Error Message - Details

• Message type: E = Error

• Message class: /SMB/MD_AS_CUST -

• Message number: 026

• Message text: RFC Connection for client &1 not defined

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SMB/MD_AS_CUST026 - RFC Connection for client &1 not defined ?

  The SAP error message /SMB/MD_AS_CUST026 RFC Connection for client &1 not defined typically indicates that there is an issue with the Remote Function Call (RFC) connection configuration for a specific client in the SAP system. This error can occur in various scenarios, particularly when trying to access or execute functions that require a valid RFC connection.
  Cause:
  
  Missing RFC Connection: The specified client does not have an RFC connection defined in the system.
  Incorrect Configuration: The RFC connection may be incorrectly configured or pointing to the wrong destination.
  Client-Specific Issues: The client in question may not be set up properly or may not exist in the system.
  Authorization Issues: The user may not have the necessary authorizations to access the specified RFC connection.
  
  Solution:
  
  
  Check RFC Connection Configuration:
  
  Go to transaction SM59 in the SAP GUI.
  Look for the RFC connection that corresponds to the client mentioned in the error message.
  If it does not exist, you will need to create a new RFC connection for that client.
  
  
  
  Create or Modify RFC Connection:
  
  If the connection is missing, create a new RFC destination by clicking on "Create" and filling in the necessary details (e.g., target host, system number, client, user, password).
  If the connection exists but is misconfigured, modify it to ensure that all parameters are correct.
  
  
  
  Check Client Configuration:
  
  Ensure that the client you are trying to connect to is properly configured and active.
  You can check client settings in transaction SCC4.
  
  
  
  Authorization Check:
  
  Verify that the user executing the function has the necessary authorizations to access the RFC connection.
  Check roles and authorizations in transaction PFCG.
  
  
  
  Test the RFC Connection:
  
  After making changes, use the "Test Connection" feature in transaction SM59 to ensure that the RFC connection is working correctly.
  
  
  
  Check Logs:
  
  Review system logs (transaction SM21) and short dumps (transaction ST22) for any additional error messages that might provide more context.
  
  
  
  Related Information:
  
  RFC Connections: Remote Function Call (RFC) is a communication interface that allows for communication between SAP systems and between SAP and non-SAP systems.
  Transaction Codes:
  
  SM59: Manage RFC connections.
  SCC4: Client administration.
  PFCG: Role maintenance for authorization checks.
  SM21: System log.
  ST22: Dump analysis.
  
  
  
  By following these steps, you should be able to resolve the error message /SMB/MD_AS_CUST026 RFC Connection for client &1 not defined. If the issue persists, consider reaching out to your SAP Basis team or consulting SAP support for further assistance.