How To Fix 0S066 - An error occurred while determining the server list

SAP Error Message - Details

• Message type: E = Error

• Message class: 0S - Messages for the SQL trace

• Message number: 066

• Message text: An error occurred while determining the server list

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 0S066 - An error occurred while determining the server list ?

  The SAP error message 0S066 ("An error occurred while determining the server list") typically indicates an issue with the SAP system's ability to retrieve or communicate with the application server list. This can occur due to various reasons, including network issues, configuration problems, or issues with the SAP kernel.
  Causes:
  
  Network Issues: Problems with the network connection between the client and the SAP server can prevent the retrieval of the server list.
  SAP Profile Configuration: Incorrect settings in the instance profile or the SAP router configuration can lead to this error.
  SAP Kernel Issues: An outdated or corrupted SAP kernel can cause communication problems.
  Load Balancer Issues: If a load balancer is used, misconfiguration can lead to issues in server list determination.
  SAP System Configuration: Issues with the SAP system configuration, such as missing or incorrect entries in the SAP system's configuration files.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there is proper network connectivity between the client and the SAP server. You can use tools like ping or traceroute to diagnose network issues.
  Review SAP Profile Settings: Check the instance profile settings in the SAP system. Ensure that the parameters related to the application server and load balancing are correctly configured.
  Update SAP Kernel: If the kernel is outdated, consider updating it to the latest version. This can resolve bugs and improve stability.
  Check Load Balancer Configuration: If a load balancer is in use, verify its configuration to ensure it is correctly routing requests to the SAP application servers.
  Review SAP Router Configuration: If you are using an SAP router, check its configuration to ensure it is set up correctly and is operational.
  Check SAP System Logs: Review the system logs (transaction SM21) for any additional error messages or warnings that could provide more context about the issue.
  Restart SAP Services: Sometimes, simply restarting the SAP services can resolve transient issues.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to error 0S066 for any specific patches or updates that may address the issue.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  SAP Support: If the issue persists, consider reaching out to SAP Support for 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 error message 0S066 in your SAP environment.