How To Fix GHO_NET030 - Link &1: connection from &2 to &3 is not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: GHO_NET - Message class for Production Network Modelling

• Message number: 030

• Message text: Link &1: connection from &2 to &3 is not allowed

Self-Explanatory Message

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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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message GHO_NET030 - Link &1: connection from &2 to &3 is not allowed ?

  The SAP error message GHO_NET030 indicates that there is a connection issue between two systems or components, where the connection from one system (identified as &2) to another (identified as &3) is not allowed. This error typically arises in the context of network connections, particularly in scenarios involving SAP Gateway, RFC (Remote Function Call), or other network-related configurations.
  Cause:
  
  Network Restrictions: The connection may be blocked due to network policies or firewall settings that prevent communication between the two systems.
  Configuration Issues: There may be incorrect settings in the SAP system configuration, such as the RFC destination settings or the logical system configuration.
  Authorization Issues: The user or system trying to establish the connection may not have the necessary authorizations to connect to the target system.
  Incorrect Hostname or IP Address: The hostname or IP address specified in the connection settings may be incorrect or unreachable.
  SAP Router Configuration: If using an SAP router, the routing configuration may not allow the connection.
  
  Solution:
  
  
  Check Network Configuration:
  
  Verify that the network allows traffic between the two systems. Check firewall rules and network policies.
  Ensure that the correct ports are open for communication.
  
  
  
  Review RFC Destination:
  
  Go to transaction SM59 in the SAP GUI and check the RFC destination settings for the connection.
  Ensure that the target system is correctly defined, and the connection type is appropriate (e.g., TCP/IP, TMW, etc.).
  
  
  
  Validate Hostname/IP:
  
  Confirm that the hostname or IP address of the target system is correct and reachable from the source system. You can use tools like ping or telnet to test connectivity.
  
  
  
  Check Authorizations:
  
  Ensure that the user or service account used for the connection has the necessary authorizations to access the target system.
  
  
  
  SAP Router Settings:
  
  If using an SAP router, check the router configuration to ensure that it allows the connection between the two systems.
  
  
  
  Consult SAP Notes:
  
  Look for relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  SM59 - RFC Destinations
  SICF - HTTP Services
  SMICM - ICM Monitor
  
  
  Logs: Check the system logs (transaction SM21) and the developer trace files (transaction ST11) for additional error messages or clues.
  Documentation: Review SAP documentation related to network configuration and RFC connections for best practices and troubleshooting tips.
  
  If the issue persists after following these steps, consider reaching out to your SAP Basis team or SAP support for further assistance.