How To Fix SB124 - No connection to target system/error in communication

SAP Error Message - Details

• Message type: E = Error

• Message class: SB - Version Management Messages

• Message number: 124

• Message text: No connection to target system/error in communication

What causes this issue?

A function module could not be executed in another SAP system, since
there was no physical connection to the target system, or communication
with the target system is faulty.

System Response

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

How to fix this error?

Inform your system administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SB124 - No connection to target system/error in communication ?

  The SAP error message SB124, which indicates "No connection to target system/error in communication," typically arises when there is a failure in establishing a connection between the SAP system and a target system (such as another SAP system, a database, or an external application). This error can occur in various scenarios, such as during remote function calls (RFC), data transfers, or when accessing external services.
  Causes of SB124 Error
  
  
  Network Issues: Problems with the network connection, such as firewalls blocking the connection, network outages, or incorrect network configurations.
  
  
  Configuration Errors: Incorrect settings in the RFC destination configuration (transaction SM59), such as wrong hostnames, ports, or connection types.
  
  
  Target System Down: The target system may be down or not reachable due to maintenance or unexpected outages.
  
  
  Authorization Issues: The user credentials used for the connection may not have the necessary authorizations to access the target system.
  
  
  SAP Gateway Issues: Problems with the SAP Gateway service, which is responsible for handling communication between systems.
  
  
  Timeout Settings: Connection timeouts may be set too low, causing the connection to fail before it can be established.
  
  
  Solutions to SB124 Error
  
  
  Check Network Connectivity:
  
  Ensure that the network connection between the SAP system and the target system is active.
  Use tools like ping or traceroute to verify connectivity.
  
  
  
  Verify RFC Destination Configuration:
  
  Go to transaction SM59 and check the configuration of the RFC destination.
  Ensure that the hostname, service, and connection type are correctly configured.
  Test the connection from SM59 to see if it succeeds.
  
  
  
  Check Target System Status:
  
  Verify that the target system is up and running.
  Check for any scheduled maintenance or outages.
  
  
  
  Review User Authorizations:
  
  Ensure that the user credentials used for the connection have the necessary authorizations in both the source and target systems.
  
  
  
  Examine SAP Gateway:
  
  Check the status of the SAP Gateway service. You can use transaction SMGW to monitor the gateway and look for any errors.
  
  
  
  Adjust Timeout Settings:
  
  If timeouts are an issue, consider increasing the timeout settings in the RFC destination configuration.
  
  
  
  Check Logs for Detailed Errors:
  
  Review the system logs (transaction SM21) and the developer traces (transaction ST22) for any additional error messages that may provide more context.
  
  
  
  Consult SAP Notes:
  
  Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to the SB124 error.
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  SM59: RFC Destinations
  SMGW: SAP Gateway Monitor
  SM21: System Log
  ST22: Dump Analysis
  
  
  
  SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance, providing them with detailed information about the error and the steps you have already taken.
  
  
  By following these steps, you should be able to diagnose and resolve the SB124 error effectively.