How To Fix ICF_SYSTEM_LOGIN211 - Session-based logon not possible; invalid host name

SAP Error Message - Details

• Message type: E = Error

• Message class: ICF_SYSTEM_LOGIN - Messages for System Logon

• Message number: 211

• Message text: Session-based logon not possible; invalid host name

What causes this issue?

Invalid host name for issuing a cookie
To enable the Web browser to send the MYSAPSSO2 cookie to the server
after it is issued, the URL must include a fully qualified domain name
(FQDN).

System Response

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

How to fix this error?

Call the logon with a fully qualified domain name.
Define the profile parameter <ZK>icm/host_name_full</> with a fully
qualified domain name.
See Note 654982 <zk>URL Requirements due to Internet Standards</>.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message ICF_SYSTEM_LOGIN211 - Session-based logon not possible; invalid host name ?

  The SAP error message ICF_SYSTEM_LOGIN211 indicates that a session-based logon is not possible due to an invalid host name. This error typically occurs in the context of the Internet Communication Framework (ICF) when trying to access an SAP system via HTTP or HTTPS.
  Causes:
  
  Invalid Host Name: The host name specified in the URL is incorrect or does not resolve to the correct IP address.
  Network Issues: There may be network connectivity issues preventing the client from reaching the SAP server.
  Configuration Issues: The ICF service may not be properly configured, or the service may not be activated.
  DNS Resolution Problems: The DNS server may not be able to resolve the host name to the correct IP address.
  Firewall Restrictions: Firewalls may be blocking access to the SAP server.
  
  Solutions:
  
  Check Host Name: Verify that the host name in the URL is correct. Ensure that it matches the server's actual host name or IP address.
  Ping the Host: Use the command line to ping the host name to check if it resolves correctly and is reachable.
  ping <hostname>
  
  Check DNS Settings: Ensure that the DNS settings on the client machine are correct and that the DNS server can resolve the host name.
  ICF Configuration:
  
  Go to transaction SICF in the SAP GUI.
  Check if the relevant ICF service is activated. If not, activate it.
  Ensure that the service is configured correctly.
  
  
  Review Network Configuration: Check for any network issues, such as routing problems or firewall settings that may be blocking access to the SAP server.
  Check SAP System Logs: Look into the SAP system logs (transaction SM21) for any additional error messages that might provide more context about the issue.
  
  Related Information:
  
  ICF Services: The Internet Communication Framework (ICF) is used for handling HTTP requests in SAP systems. Each service can be activated or deactivated in transaction SICF.
  Transaction Codes:
  
  SICF: To manage ICF services.
  SM21: To view system logs for troubleshooting.
  SICF: To check the status of the ICF services.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to ICF and session-based logon errors.
  
  If the problem persists after trying the above solutions, consider reaching out to your SAP Basis team or SAP support for further assistance.