How To Fix 00666 - Error occurred in the SAP network interface

SAP Error Message - Details

• Message type: E = Error

• Message class: 00 -

• Message number: 666

• Message text: Error occurred in the SAP network interface

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 00666 - Error occurred in the SAP network interface ?

  The SAP error message "00666 Error occurred in the SAP network interface" typically indicates a problem with the communication between the SAP application server and the client or between different SAP systems. This error can arise due to various reasons, including network issues, configuration problems, or resource limitations.
  Causes:
  
  Network Issues: Problems with the network connection, such as high latency, packet loss, or disconnections.
  Configuration Errors: Incorrect settings in the SAP system configuration, such as the SAP router settings or the network interface configuration.
  Resource Limitations: Insufficient system resources (CPU, memory, etc.) on the application server or client machine.
  Firewall or Security Settings: Firewalls or security settings that block the necessary ports for SAP communication.
  SAP Kernel Issues: Bugs or issues in the SAP kernel version being used.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection between the client and the SAP server is stable. Use tools like ping or traceroute to diagnose network issues.
  Review Configuration Settings: Verify the configuration settings in the SAP system, including the SAP router and network interface settings. Ensure that they are correctly set up.
  Monitor System Resources: Check the resource usage on the SAP application server and client. If resources are low, consider optimizing performance or upgrading hardware.
  Firewall Configuration: Ensure that the necessary ports for SAP communication (e.g., 3200 for SAP GUI) are open and not blocked by firewalls or security software.
  Update SAP Kernel: If the issue persists, consider updating the SAP kernel to the latest version, as it may contain fixes for known issues.
  Check SAP Notes: Look for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional troubleshooting steps.
  
  Related Information:
  
  SAP Support: If the issue cannot be resolved with the above steps, consider reaching out to SAP Support for further assistance.
  Logs and Traces: Check the SAP system logs (transaction SM21) and traces (transaction ST01) for more detailed error messages that can provide additional context for the issue.
  Documentation: Review SAP documentation related to network configuration and troubleshooting for more in-depth guidance.
  
  By following these steps, you should be able to diagnose and resolve the "00666 Error occurred in the SAP network interface" error.