How To Fix CACS_RTTS004 - RFC connection error for target system &1 - &2

CACS_RTTS004 - Overview

• Message type: E = Error

• Message class: CACS_RTTS - RTTS Services

• Message number: 004

• Message text: RFC connection error for target system &1 - &2

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?

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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.

Smart SAP Assistant

• What is the cause and solution for SAP error message CACS_RTTS004 - RFC connection error for target system &1 - &2 ?

  The SAP error message CACS_RTTS004 indicates an RFC (Remote Function Call) connection error to a target system. This error typically arises when there is an issue with the connection settings or the target system itself. Here’s a breakdown of the potential causes, solutions, and related information:
  Causes:
  
  Network Issues: There may be network connectivity problems between the source and target systems.
  Incorrect RFC Destination: The RFC destination may not be configured correctly in the SAP system.
  Target System Down: The target SAP system may be down or not reachable.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  Firewall Restrictions: Firewalls may be blocking the required ports for RFC communication.
  SAP Gateway Issues: The SAP Gateway service may not be running on the target system.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or traceroute to verify that the source system can reach the target system.
  
  
  
  Verify RFC Destination Configuration:
  
  Go to transaction SM59 in