How To Fix ST631 - No RFC connection could be established

SAP Error Message - Details

• Message type: E = Error

• Message class: ST - Terminology Database

• Message number: 631

• Message text: No RFC connection could be established

What causes this issue?

The system could not create a remote connection (such as for a where-
used query).

System Response

Under certain conditions you cannot carry out selected actions (for
example, deletion of terminology concepts).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message ST631 - No RFC connection could be established ?

  The SAP error message ST631 "No RFC connection could be established" typically indicates that there is an issue with the Remote Function Call (RFC) connection between the SAP system and another system (which could be another SAP system or a non-SAP system). This error can arise due to various reasons, and here are some common causes, solutions, and related information:
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the target system.
  Incorrect RFC Destination Configuration: The RFC destination may not be configured correctly in the SAP system.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  Target System Down: The target system may be down or not reachable.
  Firewall Restrictions: Firewalls may be blocking the required ports for RFC communication.
  SAP Gateway Issues: The SAP Gateway service may not be running or may be misconfigured.
  Incorrect Hostname or IP Address: The hostname or IP address specified in the RFC destination may be incorrect.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or telnet to check if the target system is reachable from the SAP system.
  Ensure that there are no network outages or issues.
  
  
  
  Verify RFC Destination Configuration:
  
  Go to transaction SM59 in the SAP GUI.
  Check the configuration of the RFC destination (e.g., TCP/IP settings, target host, and service).
  Test the connection using the "Connection Test" button.
  
  
  
  Check User Authorizations:
  
  Ensure that the user credentials used for the RFC connection have the necessary authorizations to access the target system.
  
  
  
  Check Target System Status:
  
  Verify that the target system is up and running and that the necessary services are active.
  
  
  
  Review Firewall Settings:
  
  Ensure that the firewall settings allow traffic on the required ports for RFC communication (typically port 3200 for SAP).
  
  
  
  Check SAP Gateway:
  
  Ensure that the SAP Gateway service is running on the SAP system.
  You can check the status of the gateway using transaction SMGW.
  
  
  
  Correct Hostname/IP Address:
  
  Verify that the hostname or IP address specified in the RFC destination is correct and resolves properly.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: To manage RFC destinations.
  SMGW: To monitor the SAP Gateway.
  SICF: To check and manage HTTP services.
  
  
  
  Logs and Traces:
  
  Check the system logs (SM21) and developer traces (ST22) for any additional error messages that may provide more context.
  
  
  
  SAP Notes: 
  
  Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to RFC connections.
  
  
  
  By following these steps, you should be able to diagnose and resolve the ST631 error in your SAP environment. If the issue persists, consider reaching out to your SAP Basis team or SAP support for further assistance.