How To Fix S_UNIFIED_CON066 - Host &1 has the same IP address and port number

SAP Error Message - Details

• Message type: E = Error

• Message class: S_UNIFIED_CON - Message Class for Unified Connectivity

• Message number: 066

• Message text: Host &1 has the same IP address and port number

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message S_UNIFIED_CON066 - Host &1 has the same IP address and port number ?

  The SAP error message S_UNIFIED_CON066 indicates that there is a conflict with the host configuration, specifically that two or more hosts are trying to use the same IP address and port number. This can occur in various scenarios, such as when multiple instances of an SAP system are configured incorrectly or when there are network issues.
  Cause:
  
  Duplicate Host Configuration: Two or more SAP instances or services are configured to use the same IP address and port number.
  Network Misconfiguration: There may be a misconfiguration in the network settings, leading to multiple services being assigned the same address.
  Virtualization Issues: In virtualized environments, if multiple virtual machines are incorrectly configured, they might end up with the same IP address.
  DNS Issues: If DNS is not resolving correctly, it might lead to conflicts in hostnames and IP addresses.
  
  Solution:
  
  
  Check Host Configuration:
  
  Review the configuration files for the SAP instances (e.g., instance profile, sapstart, etc.) to ensure that each instance has a unique combination of IP address and port number.
  Use transaction SICF to check the HTTP services and ensure there are no duplicates.
  
  
  
  Network Configuration:
  
  Verify the network settings on the server to ensure that each instance is assigned a unique IP address.
  Check the network configuration files (like /etc/hosts on Unix/Linux systems) for any duplicate entries.
  
  
  
  Adjust Port Numbers:
  
  If you have multiple instances running on the same server, ensure that they are configured to use different port numbers. You can change the port numbers in the instance profile.
  
  
  
  Restart Services:
  
  After making changes, restart the affected SAP instances or services to apply the new configurations.
  
  
  
  Check for Virtualization Conflicts:
  
  If you are using virtual machines, ensure that each VM has a unique IP address assigned and that there are no conflicts in the virtual network settings.
  
  
  
  DNS Resolution:
  
  Ensure that DNS is correctly configured and that there are no conflicting entries that could lead to the same IP address being resolved for different hostnames.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to this error message for any specific patches or updates that may address the issue.
  Logs: Review the SAP system logs (e.g., dev_w0, dev_rfc) for additional context or related error messages that could provide more insight into the issue.
  Documentation: Refer to SAP documentation for network configuration and instance management for best practices.
  
  By following these steps, you should be able to resolve the S_UNIFIED_CON066 error and ensure that your SAP system is configured correctly without IP address conflicts.