How To Fix UCI1005 - No connection could be established with target system &1

SAP Error Message - Details

• Message type: E = Error

• Message class: UCI1 - Text for Delta Load

• Message number: 005

• Message text: No connection could be established with target system &1

What causes this issue?

A connection to target system &V1& could not be established.

System Response

Processing will be terminated.

How to fix this error?

Make sure that the following prerequisites are given:
The target system is working and can be logged into.
The logical destination is defined correctly and you can log in as a
<DS:GLOS.49804AF2744DDD4DAEE3FD126F1B4FD6>remote user</>.
If the problem persists, please notify SAP.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UCI1005 - No connection could be established with target system &1 ?

  The SAP error message UCI1005, which states "No connection could be established with target system &1," typically indicates that there is an issue with the connection between your SAP system and the target system (which could be another SAP system or a non-SAP system). This error can occur in various contexts, such as during data transfer, remote function calls (RFC), or when trying to access external systems.
  Causes:
  
  Network Issues: There may be network connectivity problems between the source and target systems. This could be due to firewalls, routing issues, or network outages.
  Configuration Errors: The connection settings in the SAP system (such as RFC destinations) may be incorrectly configured. This includes incorrect hostnames, IP addresses, or ports.
  Target System Down: The target system may be down or not reachable due to maintenance or other issues.
  Authorization Issues: The user credentials used to establish the connection may not have the necessary permissions to access the target system.
  SAP Gateway Issues: The SAP Gateway service may not be running or may be misconfigured on either the source or target system.
  Protocol Mismatch: There may be a mismatch in the communication protocols being used (e.g., HTTP vs. HTTPS).
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or traceroute to check if the target system is reachable from the source system.
  Ensure that there are no firewall rules blocking the connection.
  
  
  
  Verify RFC Destination Configuration:
  
  Go to transaction SM59 in the SAP GUI and check the configuration of the RFC destination.
  Ensure that the hostname, service, and connection type are correctly set.
  Test the connection from within SM59 to see if it succeeds.
  
  
  
  Check Target System Status:
  
  Ensure that the target system is up and running. If it is down, coordinate with the system administrators to bring it back online.
  
  
  
  Review User Authorizations:
  
  Check if the user credentials used for the connection have the necessary authorizations to access the target system.
  
  
  
  Check SAP Gateway Configuration:
  
  Ensure that the SAP Gateway is running on both systems. You can check this using transaction SMGW.
  Review the gateway logs for any errors.
  
  
  
  Protocol Settings:
  
  Ensure that the correct communication protocol is being used. If the target system requires HTTPS, make sure that the RFC destination is configured accordingly.
  
  
  
  Review Logs:
  
  Check the system logs (transaction SM21) and the application logs (transaction SLG1) for any additional error messages that might provide more context.
  
  
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to UCI1005.
  Documentation: Review SAP documentation related to RFC connections and network configuration for best practices.
  Community Forums: Consider checking SAP Community forums or other technical forums for similar issues and solutions shared by other users.
  
  By following these steps, you should be able to diagnose and resolve the UCI1005 error in your SAP environment.