How To Fix CNVMBTRFC143 - rfc check timed out

SAP Error Message - Details

• Message type: E = Error

• Message class: CNVMBTRFC - Messages used in RFC Management and its objects

• Message number: 143

• Message text: rfc check timed out

What causes this issue?

The reason for the bad connection state was that the RFC connection
check exceeds a period of time. To avoid the calling program from
getting a time out we do the rfc checks asychronously. If the connection
check don?t respond in a period of time then the destination get the
connection state 'N'.

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?

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 CNVMBTRFC143 - rfc check timed out ?

  The SAP error message CNVMBTRFC143: RFC check timed out typically occurs during a Remote Function Call (RFC) operation, indicating that the system was unable to complete the RFC check within the expected time frame. This can happen for various reasons, including network issues, system performance problems, or configuration errors.
  Causes:
  
  Network Latency: High latency or unstable network connections between the systems involved in the RFC call can lead to timeouts.
  System Performance: If the SAP system is under heavy load or if there are performance issues (e.g., long-running processes, insufficient resources), it may not respond in time.
  Configuration Issues: Incorrect settings in the RFC destination or in the SAP system configuration can lead to timeouts.
  Long-running Processes: If the function module being called takes too long to execute, it may exceed the timeout threshold.
  Firewall or Security Settings: Firewalls or security settings may block or slow down the RFC communication.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection between the systems is stable and has low latency. You can use tools like ping or traceroute to diagnose network issues.
  Monitor System Performance: Check the performance of the SAP system. Use transaction codes like ST03N (Workload Analysis) or ST22 (Dump Analysis) to identify any performance bottlenecks.
  Increase Timeout Settings: If the function module legitimately takes a long time to execute, consider increasing the timeout settings for the RFC connection. This can be done in the RFC destination settings (transaction code SM59).
  Review RFC Destination Configuration: Ensure that the RFC destination is correctly configured. Check for any errors in the configuration and test the connection using the "Test Connection" option in SM59.
  Check for Long-running Jobs: Investigate if there are any long-running jobs or processes that might be affecting system performance. You can use transaction SM37 to monitor background jobs.
  Firewall and Security Settings: Ensure that there are no firewall rules or security settings that might be interfering with the RFC communication.
  
  Related Information:
  
  
  Transaction Codes: 
  
  SM59: RFC Destinations - to configure and test RFC connections.
  ST03N: Workload Analysis - to monitor system performance.
  SM37: Job Monitoring - to check for long-running jobs.
  ST22: Dump Analysis - to analyze any runtime errors.
  
  
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.