GS855 - RFC connection & is invalid or does not exist

SAP Error Message - Details

• Message type: E = Error

• Message class: GS - Sets

• Message number: 855

• Message text: RFC connection & is invalid or does not exist

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

AnswerBot

• What is the cause and solution for SAP error message GS855 - RFC connection & is invalid or does not exist ?

  The SAP error message GS855 indicates that there is an issue with an RFC (Remote Function Call) connection. This error typically means that the specified RFC destination is either invalid or does not exist in the SAP system. Here are the potential causes, solutions, and related information for this error:
  Causes:
  
  Invalid RFC Destination: The RFC destination you are trying to use may not be defined in the SAP system.
  Connection Issues: There may be network issues preventing the connection to the target system.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  Configuration Errors: The configuration settings for the RFC destination may be incorrect (e.g., wrong hostname, port, or system ID).
  System Down: The target SAP system may be down or not reachable.
  
  Solutions:
  
  
  Check RFC Destination:
  
  Go to transaction SM59 in the SAP GUI.
  Verify that the RFC destination you are trying to use exists and is correctly configured.
  Test the connection using the "Test Connection" button to ensure it is working.
  
  
  
  Review Configuration:
  
  Ensure that the connection parameters (like hostname, system number, client, user, password, etc.) are correctly set up.
  Check if the target system is up and running.
  
  
  
  Check Authorizations:
  
  Ensure that the user credentials used for the RFC connection have the necessary authorizations to access the target system.
  
  
  
  Network Issues:
  
  Check for any network issues that might be preventing the connection. This could include firewall settings, VPN issues, or DNS resolution problems.
  
  
  
  Check Logs:
  
  Review the system logs (transaction SM21) and the developer traces (transaction ST22) for any additional error messages that might provide more context.
  
  
  
  Consult Basis Team:
  
  If you are unable to resolve the issue, consult your SAP Basis team for assistance. They can help with deeper diagnostics and configuration checks.
  
  
  
  Related Information:
  
  RFC Destinations: RFC destinations are defined in transaction SM59. They can be of different types, such as TCP/IP connections, HTTP connections, etc.
  Authorization Objects: Ensure that the user has the necessary authorization objects assigned, such as S_RFC, to perform RFC calls.
  SAP Notes: Check SAP Notes for any known issues or patches related to RFC connections.
  
  By following these steps, you should be able to diagnose and resolve the GS855 error related to RFC connections in SAP.