How To Fix CMS034 - Error in RFC communication - &

SAP Error Message - Details

• Message type: E = Error

• Message class: CMS - KPro: Content Management Service

• Message number: 034

• Message text: Error in RFC communication - &

What causes this issue?

A problem occurred while establishing the connection or in
communication.
&v1&

System Response

The function cannot be executed.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

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 CMS034 - Error in RFC communication - & ?

  The SAP error message CMS034, which indicates "Error in RFC communication," typically arises when there is a problem with the Remote Function Call (RFC) communication between SAP systems or between an SAP system and an external system. This error can occur due to various reasons, and understanding the cause is essential for troubleshooting.
  Causes of CMS034 Error
  
  
  Network Issues: Problems with the network connection can lead to communication failures. This could be due to firewalls, network outages, or incorrect network configurations.
  
  
  RFC Destination Configuration: The RFC destination may not be configured correctly in the SAP system. This includes incorrect settings for the target system, such as the system ID, client number, user credentials, or connection type.
  
  
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to perform the requested operation.
  
  
  System Availability: The target SAP system may be down or not reachable, leading to communication errors.
  
  
  Version Compatibility: Incompatibility between different SAP versions or components can also lead to RFC communication issues.
  
  
  Timeout Settings: If the RFC call takes too long to respond, it may exceed the timeout settings, resulting in an error.
  
  
  Solutions to CMS034 Error
  
  
  Check Network Connectivity: Ensure that there is a stable network connection between the systems involved. You can use tools like ping or traceroute to diagnose network issues.
  
  
  Verify RFC Destination: Go to transaction SM59 in the SAP GUI and check the configuration of the RFC destination. Ensure that all parameters (like target host, system number, client, user, and password) are correct.
  
  
  Test RFC Connection: In transaction SM59, you can test the RFC connection to see if it is working properly. This will help identify if the issue is with the configuration or the network.
  
  
  Check User Authorizations: Ensure that the user used for the RFC connection has the necessary authorizations to execute the required functions.
  
  
  Monitor System Status: Check if the target system is up and running. You can use transaction SM51 to see the status of application servers.
  
  
  Review Logs: Check the system logs (transaction SM21) and the developer trace files (transaction ST11) for any additional error messages that might provide more context.
  
  
  Adjust Timeout Settings: If the RFC call is timing out, consider increasing the timeout settings in the RFC destination configuration.
  
  
  Consult SAP Notes: Look for relevant SAP Notes in the SAP Support Portal that might address specific issues related to RFC communication.
  
  
  Related Information
  
  
  Transaction Codes:
  
  SM59: RFC Destinations
  SM21: System Log
  ST22: Dump Analysis
  ST11: Developer Traces
  SM51: List of Active Application Servers
  
  
  
  SAP Notes: Always check for SAP Notes related to RFC communication issues, as they may provide specific fixes or patches.
  
  
  Documentation: Refer to SAP Help documentation for detailed information on RFC communication and troubleshooting steps.
  
  
  By following these steps, you should be able to identify and resolve the CMS034 error in your SAP environment. If the issue persists, consider reaching out to SAP support for further assistance.