How To Fix SY559 - Virtual host is not configured: &1, port &2, with SNC

SAP Error Message - Details

• Message type: E = Error

• Message class: SY - ABAP/4 system messages

• Message number: 559

• Message text: Virtual host is not configured: &1, port &2, with SNC

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SY559 - Virtual host is not configured: &1, port &2, with SNC ?

  The SAP error message SY559 indicates that there is an issue with the configuration of a virtual host in the context of Secure Network Communications (SNC). This error typically arises when the system is trying to establish a connection using SNC, but the specified virtual host and port are not properly configured in the SAP system.
  Cause:
  
  Missing Configuration: The virtual host and port specified in the SNC settings are not configured in the SAP system.
  Incorrect Hostname or Port: The hostname or port number provided in the SNC settings may be incorrect or not reachable.
  Network Issues: There may be network issues preventing the connection to the specified virtual host.
  SNC Library Issues: The SNC library may not be properly installed or configured on the SAP application server.
  
  Solution:
  
  
  Check SNC Configuration:
  
  Go to transaction RZ10 and check the profile parameters related to SNC, such as snc/enable, snc/identity/as, and snc/identity/client.
  Ensure that the virtual host and port are correctly specified in the SNC parameters.
  
  
  
  Verify Hostname and Port:
  
  Ensure that the hostname and port specified in the SNC settings are correct and that the server is reachable.
  You can use tools like ping or telnet to check connectivity to the specified host and port.
  
  
  
  Update the SAP Profile:
  
  If the virtual host is not configured, you may need to add it to the SAP profile. This can be done by editing the instance profile in transaction RZ10.
  After making changes, restart the SAP instance for the changes to take effect.
  
  
  
  Check SNC Library:
  
  Ensure that the SNC library is installed and properly configured on the SAP application server.
  Verify that the correct version of the SNC library is being used and that it is compatible with your SAP version.
  
  
  
  Review SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation related to SNC configuration for any additional settings that may be required.
  
  
  
  Related Information:
  
  SNC (Secure Network Communications): A security protocol that provides encryption and authentication for SAP communications.
  SAP Profile Parameters: Configuration settings that control the behavior of the SAP system.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as RZ10 (Profile Maintenance), RZ11 (Profile Parameter Display), and SNC-related transactions for further configuration and troubleshooting.
  
  If the issue persists after following these steps, consider reaching out to SAP support for further assistance.