How To Fix ACE_ML004 - All RFC destinations are established.

SAP Error Message - Details

• Message type: E = Error

• Message class: ACE_ML -

• Message number: 004

• Message text: All RFC destinations are established.

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message ACE_ML004 - All RFC destinations are established. ?

  The SAP error message ACE_ML004, which states "All RFC destinations are established," typically indicates that there is an issue with the Remote Function Call (RFC) connections in your SAP system. This message can arise in various contexts, particularly when dealing with middleware or integration scenarios where multiple systems need to communicate with each other.
  Cause:
  
  
  RFC Destination Configuration: The RFC destinations may not be configured correctly in the SAP system. This could include incorrect connection parameters, such as the target system's hostname, system number, client, user credentials, etc.
  
  
  Network Issues: There may be network connectivity issues between the SAP system and the target system. This could be due to firewall settings, network outages, or incorrect routing.
  
  
  System Availability: The target system may be down or not reachable. This could be due to maintenance, downtime, or other operational issues.
  
  
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to establish the connection.
  
  
  SAP Gateway Issues: The SAP Gateway service may not be running or may be misconfigured, preventing the establishment of RFC connections.
  
  
  Solution:
  
  
  Check RFC Destination Configuration:
  
  Go to transaction SM59 in the SAP GUI.
  Verify the configuration of the RFC destinations. Ensure that the connection parameters (like hostname, system number, client, user, and password) are correct.
  Test the connection using the "Connection Test" button in the RFC destination configuration.
  
  
  
  Network Connectivity:
  
  Check the network connectivity between the SAP system and the target system. You can use tools like ping or telnet to verify connectivity.
  Ensure that any firewalls or network security settings allow traffic between the two systems.
  
  
  
  Check System Availability:
  
  Verify that the target system is up and running. You can check the system status or logs to see if there are any issues.
  
  
  
  Authorization Check:
  
  Ensure that the user credentials used for the RFC connection have the necessary authorizations. You can check user roles and authorizations in transaction SU01.
  
  
  
  SAP Gateway Configuration:
  
  Ensure that the SAP Gateway service is running. You can check this in transaction SMGW.
  Review the gateway logs for any errors or issues that may indicate why the RFC connections are failing.
  
  
  
  Review Logs:
  
  Check the application logs (transaction SLG1) and system logs (transaction SM21) for any related error messages that could provide more context on the issue.
  
  
  
  Related Information:
  
  Documentation: Refer to SAP Help documentation for detailed information on configuring RFC destinations and troubleshooting RFC issues.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to RFC connections.
  Community Forums: Engage with the SAP Community or 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 ACE_ML004 error message in your SAP system.