How To Fix TT356 - RFC error & &

SAP Error Message - Details

• Message type: E = Error

• Message class: TT - Extended Computer Aided Test Tool (eCATT) messages

• Message number: 356

• Message text: RFC error & &

What causes this issue?

RFC Error
You want to remotely execute a test or individual functions of a test
using internally a Remote Function Call (RFC) interface. The system
requires an RFC destination that is processed using transaction SM59.
RFC System Error
This error occurs if a system is terminated on the receiver side.
RFC Communication Error
This error is raised if a problem occurs when establishing the
connection or the communication.

System Response

All RFC errors are registered in the log. In addition, entries are
created in the system log and dumps are written in case of terminations.

How to fix this error?

In its variable part, the error message entered in the log contains an
error text that is output by the RFC interface.
In many cases, the error text describes the cause of the problem so
accurately that the problem can be solved or avoided.
If the error text is unclear or too general - for example, CONNECTION
CLOSED -, you must find other ways to search for the cause of the
problem.
You can search for information in the source system and target system
using the following transactions:
SM21 System log display
ST22 Dump analysis
There are only a few RFC errors for which no system log entries or dumps
are created. In these cases, an RFC trace can help to find the cause of
the error. A corresponding RFC trace option is provided by the
transaction
ST01 System trace

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TT356 - RFC error & & ?

  The SAP error message TT356, which indicates an RFC (Remote Function Call) error, typically arises when there is a problem with the communication between SAP systems or between an SAP system and an external system. The error message may include additional details that can help diagnose the specific issue.
  Possible Causes of TT356 RFC Error:
  
  
  Network Issues: There may be network connectivity problems between the SAP systems or between the SAP system and the external system.
  
  
  Configuration Issues: Incorrect RFC destination configuration in the SAP system can lead to this error. This includes incorrect settings in transaction SM59.
  
  
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to execute the requested function.
  
  
  System Availability: The target system may be down or not reachable due to maintenance or other issues.
  
  
  Timeouts: The RFC call may be timing out due to long processing times or network delays.
  
  
  Version Compatibility: There may be compatibility issues between different versions of SAP systems.
  
  
  Solutions to TT356 RFC Error:
  
  
  Check Network Connectivity:
  
  Ensure that the network connection between the systems is stable and operational. You can use tools like ping or traceroute to test connectivity.
  
  
  
  Verify RFC Destination:
  
  Go to transaction SM59 and check the configuration of the RFC destination. Ensure that the connection type, target host, and system number are correctly configured.
  
  
  
  Test RFC Connection:
  
  In transaction SM59, use the "Test Connection" feature to verify that the RFC destination is working correctly.
  
  
  
  Check User Authorizations:
  
  Ensure that the user ID used for the RFC connection has the necessary authorizations to perform the requested actions.
  
  
  
  Review System Logs:
  
  Check the system logs (transaction SM21) and the developer trace files (transaction ST11) for any additional error messages or clues.
  
  
  
  Increase Timeout Settings:
  
  If timeouts are an issue, consider increasing the timeout settings in the RFC destination configuration.
  
  
  
  Check System Status:
  
  Ensure that the target system is up and running. You can check the status of the system in transaction SM51.
  
  
  
  Consult SAP Notes:
  
  Look for relevant SAP Notes in the SAP Support Portal that may address known issues related to RFC errors.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: RFC Destinations
  SM21: System Log
  ST22: Dump Analysis
  ST01: System Trace
  ST11: Developer Traces
  
  
  
  SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further 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 TT356 RFC error in your SAP environment.