How To Fix SY309 - Error in connection setup (CMALLC), return code = &

SAP Error Message - Details

• Message type: E = Error

• Message class: SY - ABAP/4 system messages

• Message number: 309

• Message text: Error in connection setup (CMALLC), return code = &

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 SY309 - Error in connection setup (CMALLC), return code = & ?

  The SAP error message SY309 indicates that there is an issue with the connection setup for the CMALLC (Central Management and Administration Layer Connection) component. The return code provided in the error message can give more specific information about the nature of the problem.
  Possible Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the database or application server.
  Configuration Errors: Incorrect configuration settings in the SAP system or in the database connection parameters.
  Authorization Issues: The user or service account may not have the necessary permissions to establish the connection.
  Service Availability: The service that the connection is trying to reach may be down or not running.
  Firewall Restrictions: Firewalls or security settings may be blocking the connection.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Ensure that the network connection between the SAP system and the target server is stable and operational.
  Use tools like ping or traceroute to diagnose network issues.
  
  
  
  Review Configuration Settings:
  
  Verify the connection parameters in the SAP system (e.g., database connection settings, application server settings).
  Check the tnsnames.ora file (for Oracle databases) or equivalent configuration files for correctness.
  
  
  
  Check User Authorizations:
  
  Ensure that the user or service account used for the connection has the necessary permissions to access the database or application server.
  
  
  
  Verify Service Status:
  
  Check if the target service (e.g., database service) is running and accessible.
  Restart the service if necessary.
  
  
  
  Firewall and Security Settings:
  
  Review firewall rules and security settings to ensure that they allow traffic on the required ports for the connection.
  
  
  
  Check SAP Notes:
  
  Look for relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  
  Return Code: The return code in the error message can provide more specific information about the error. Common return codes include:
  
  0: Success
  1: General error
  2: Connection refused
  3: Timeout
  Check SAP documentation or support for detailed meanings of specific return codes.
  
  
  
  SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance. Provide them with the full error message, return code, and any relevant logs.
  
  
  Logs: Check the SAP system logs (transaction SM21) and the application server logs for more detailed error messages that can help diagnose the issue.
  
  
  By following these steps, you should be able to identify and resolve the cause of the SY309 error in your SAP system.