How To Fix OT603 - Error during remote function call

SAP Error Message - Details

• Message type: E = Error

• Message class: OT - SAP Online Correction Support (SOCS)

• Message number: 603

• Message text: Error during remote function call

What causes this issue?

An error occurred during the execution of the RFC module.
Return code .......: &V1&
Destination .......: &V2&
Module ............: &V3&
Meaning of the return code:
03 System error
04 Communication error
Possible causes:
03 No authorization to log on to destination system
04 Timeout while establishing the connection
(does the partner exist?)

System Response

Processing was cancelled.

How to fix this error?

Please inform your system adminstrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OT603 - Error during remote function call ?

  The SAP error message OT603, which indicates "Error during remote function call," typically occurs when there is a problem with the communication between SAP systems or between an SAP system and an external system. This error can arise due to various reasons, including network issues, configuration problems, or issues with the remote function call (RFC) destination.
  Causes of OT603 Error
  
  
  Network Issues: Problems with the network connection between the systems can lead to this error. This includes issues like firewalls blocking the connection, network outages, or incorrect routing.
  
  
  RFC Destination Configuration: The RFC destination may not be configured correctly. 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 call may not have the necessary authorizations to execute the function module or access the required data.
  
  
  System Availability: The target system may be down or not available for some reason, such as maintenance or unexpected downtime.
  
  
  Function Module Issues: The function module being called may not exist, may have been changed, or may have issues that prevent it from executing properly.
  
  
  Timeouts: If the remote function call takes too long to execute, it may time out, leading to this error.
  
  
  Solutions to OT603 Error
  
  
  Check Network Connectivity: Ensure that there is proper network connectivity between the systems. 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.
  
  
  Check Authorizations: Ensure that the user credentials used for the RFC call have the necessary authorizations to execute the function module. You can check this in transaction SU53 after the error occurs.
  
  
  System Status: Check the status of the target system to ensure it is up and running. You can do this by logging into the target system or checking system logs.
  
  
  Review Function Module: If the error is related to a specific function module, check if it exists and is functioning correctly. You can test the function module in transaction SE37.
  
  
  Increase Timeout Settings: If timeouts are an issue, consider increasing the timeout settings for the RFC connection in transaction SM59.
  
  
  Check Logs: Review the system logs (transaction SM21) and the application logs (transaction SLG1) for any additional error messages or information that can help diagnose the issue.
  
  
  Related Information
  
  
  Transaction Codes:
  
  SM59: RFC Destinations
  SU53: Authorization Check
  SE37: Function Module
  SM21: System Log
  SLG1: Application Log
  
  
  
  SAP Notes: Check SAP Notes related to OT603 for any specific patches or updates that may address known issues.
  
  
  Documentation: Refer to SAP documentation for detailed information on RFC and troubleshooting remote function calls.
  
  
  By following these steps, you should be able to diagnose and resolve the OT603 error in your SAP environment.