How To Fix RSDD_ZA392 - RFC connection is used by applications of another host. Adjust this

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDD_ZA - Messages from TREX Aggregate Area

• Message number: 392

• Message text: RFC connection is used by applications of another host. Adjust this

What causes this issue?

The RFC connection is also being used by applications on other hosts.
This causes interferences in the various applications.

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?

Manual adjustment of the RFC connection is required. Contact your system
administrator or SAP support.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RSDD_ZA392 - RFC connection is used by applications of another host. Adjust this ?

  The SAP error message RSDD_ZA392 indicates that an RFC (Remote Function Call) connection is being used by applications from a different host than the one you are trying to access. This typically occurs in scenarios where multiple systems or applications are trying to access the same RFC destination, leading to conflicts.
  Cause:
  
  Multiple Applications: The RFC connection is being utilized by applications running on different hosts, which can lead to contention or conflicts.
  Configuration Issues: The RFC destination may not be properly configured, or there may be issues with the network or firewall settings that prevent proper communication.
  Session Limits: The maximum number of allowed sessions for the RFC connection may have been reached, causing the system to reject new connections from the current host.
  
  Solution:
  
  
  Check RFC Configuration:
  
  Go to transaction SM59 in the SAP GUI.
  Verify the configuration of the RFC destination that is causing the issue. Ensure that it is set up correctly and that the target system is reachable.
  
  
  
  Review Application Usage:
  
  Identify which applications are using the RFC connection and from which hosts they are being accessed. If possible, limit the number of applications accessing the same RFC connection simultaneously.
  
  
  
  Adjust Session Limits:
  
  If the issue is related to session limits, you may need to increase the number of allowed sessions for the RFC connection. This can be done in the RFC destination settings in SM59.
  
  
  
  Network and Firewall Settings:
  
  Ensure that there are no network or firewall issues preventing proper communication between the hosts. Check for any restrictions that may be in place.
  
  
  
  Restart the Application:
  
  If the application using the RFC connection can be restarted, doing so may help clear any existing connections and resolve the issue.
  
  
  
  Check for Locks:
  
  Use transaction SM12 to check for any locks that may be preventing the RFC connection from being used properly. Clear any unnecessary locks if applicable.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: RFC Destinations
  SM12: Display and Delete Locks
  SM21: System Log
  ST22: Dump Analysis
  
  
  
  Documentation: Refer to the official SAP documentation for more details on RFC connections and troubleshooting.
  
  
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  
  By following these steps, you should be able to diagnose and resolve the issue related to the RFC connection being used by applications from another host.