How To Fix CMS171 - RFC Destination &1 Inaccessible: &2&3&4

SAP Error Message - Details

• Message type: E = Error

• Message class: CMS - KPro: Content Management Service

• Message number: 171

• Message text: RFC Destination &1 Inaccessible: &2&3&4

What causes this issue?

The RFC destination &v1& is not accessible:
&V2&&V3&&V4&

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

Check the RFC destination &v1& (<DS:TRAN.SM59>Define the RFC
destinations</>) and the installation of the accompanying program.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CMS171 - RFC Destination &1 Inaccessible: &2&3&4 ?

  The SAP error message CMS171 indicates that a Remote Function Call (RFC) destination is inaccessible. This can occur for various reasons, and understanding the cause is essential for troubleshooting and resolving the issue. Here’s a breakdown of the potential causes, solutions, and related information for this error message:
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the target system defined in the RFC destination.
  Incorrect Configuration: The RFC destination may be incorrectly configured, such as wrong connection parameters (e.g., wrong hostname, port, or system ID).
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to access the target system.
  Target System Down: The target SAP system may be down or not reachable due to maintenance or other issues.
  Firewall Restrictions: Firewalls or security settings may be blocking the connection to the target system.
  SAP Gateway Issues: The SAP Gateway service may not be running or may be misconfigured.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or telnet to check if the target system is reachable from the source 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., connection type, target host, system number, etc.).
  Test the connection using the "Connection Test" button in the RFC destination settings.
  
  
  
  Review User Authorizations:
  
  Ensure that the user credentials used for the RFC connection have the necessary authorizations in the target system.
  Check the user roles and profiles assigned to the user.
  
  
  
  Check Target System Status:
  
  Verify that the target SAP system is up and running.
  Check for any scheduled maintenance or downtime.
  
  
  
  Firewall and Security Settings:
  
  Ensure that firewalls are configured to allow traffic between the two systems on the required ports.
  Consult with your network/security team if necessary.
  
  
  
  SAP Gateway Configuration:
  
  Ensure that the SAP Gateway service is running on both the source and target systems.
  Check the gateway logs for any errors or issues.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: To manage and test 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 related error messages that could provide more context.
  Use transaction SLG1 to check application logs for any relevant entries.
  
  
  
  SAP Notes: 
  
  Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to RFC connectivity.
  
  
  
  By following these steps, you should be able to identify the cause of the CMS171 error and implement the appropriate solution. If the issue persists, consider reaching out to SAP support for further assistance.