How To Fix /UI2/SAP_NWBC036 - Target system alias "&1" (or "&1_RFC") for entry &2 is invalid.

SAP Error Message - Details

• Message type: E = Error

• Message class: /UI2/SAP_NWBC -

• Message number: 036

• Message text: Target system alias "&1" (or "&1_RFC") for entry &2 is invalid.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /UI2/SAP_NWBC036 - Target system alias "&1" (or "&1_RFC") for entry &2 is invalid. ?

  The SAP error message /UI2/SAP_NWBC036 indicates that there is an issue with the target system alias specified in the configuration for the SAP NetWeaver Business Client (NWBC). This error typically arises when the system alias is either not defined, incorrectly configured, or the target system is not reachable.
  Cause:
  
  Invalid Target System Alias: The alias specified in the configuration does not exist in the system.
  Missing RFC Destination: The corresponding RFC destination for the target system alias is not defined in the SAP system.
  Network Issues: There may be network connectivity issues preventing access to the target system.
  Authorization Issues: The user may not have the necessary authorizations to access the target system.
  Configuration Errors: There may be errors in the configuration settings for the NWBC or the target system.
  
  Solution:
  
  
  Check Target System Alias:
  
  Go to transaction SM59 and check if the RFC destination corresponding to the target system alias exists.
  Ensure that the alias is correctly defined and matches the expected format.
  
  
  
  Create or Correct RFC Destination:
  
  If the RFC destination does not exist, create it in transaction SM59.
  If it exists but is incorrect, modify it to ensure it points to the correct target system.
  
  
  
  Test RFC Connection:
  
  Use the "Test Connection" feature in SM59 to verify that the connection to the target system is working properly.
  
  
  
  Check Network Connectivity:
  
  Ensure that there are no network issues preventing access to the target system. This may involve checking firewalls, VPNs, or other network configurations.
  
  
  
  Review Authorizations:
  
  Ensure that the user has the necessary authorizations to access the target system. This may involve checking roles and profiles assigned to the user.
  
  
  
  Check Configuration in NWBC:
  
  Review the configuration settings in the NWBC to ensure that the target system alias is correctly specified.
  
  
  
  Consult SAP Notes:
  
  Check for any relevant SAP Notes that may provide additional guidance or patches related to this error.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  SM59 (RFC Destinations)
  SU01 (User Maintenance)
  PFCG (Role Maintenance)
  
  
  
  Documentation: 
  
  SAP Help Portal for NWBC and RFC configuration.
  
  
  
  SAP Community: 
  
  Consider searching or posting in the SAP Community forums for additional insights from other users who may have encountered similar issues.
  
  
  
  By following these steps, you should be able to identify and resolve the issue related to the /UI2/SAP_NWBC036 error message.