How To Fix 2Q001 - System &1 on host &2 already known

SAP Error Message - Details

• Message type: E = Error

• Message class: 2Q - TMS Service Message Class

• Message number: 001

• Message text: System &1 on host &2 already known

What causes this issue?

You tried to request a domain link for the system &V1& on the host &V2&
with service number &V3&. However, this system is already known.

System Response

The request for a domain link is not created.

How to fix this error?

Correct your entry or delete system &V1& from the current domain.

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 2Q001 - System &1 on host &2 already known ?

  The SAP error message 2Q001 indicates that a system with the specified name is already known on the host. This typically occurs in scenarios involving system configuration, such as when setting up a new SAP system or during system replication.
  Cause:
  The error is usually caused by one of the following:
  
  Duplicate System Name: The system name you are trying to register or configure is already in use on the specified host.
  Incorrect Configuration: There may be a misconfiguration in the system landscape or in the SAP instance settings.
  Previous Installation: An earlier installation or configuration of the same system name may not have been completely removed.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Existing Systems:
  
  Use transaction SMLG or SMLT to check the list of existing systems and their configurations. Ensure that the system name you are trying to register is not already listed.
  
  
  
  Rename or Remove Duplicate:
  
  If the system name is indeed in use, consider renaming the new system or removing the existing one if it is no longer needed. Be cautious with this step to avoid data loss.
  
  
  
  Review Configuration Files:
  
  Check the configuration files (like instance profile or sapstart files) for any references to the existing system. Ensure that there are no remnants of the previous installation.
  
  
  
  Check Host Entries:
  
  Verify the host entries in the /etc/hosts file or DNS settings to ensure that there are no conflicts with the system names.
  
  
  
  Restart Services:
  
  After making changes, restart the SAP services to ensure that the changes take effect.
  
  
  
  Consult SAP Notes:
  
  Look for relevant SAP Notes in the SAP Support Portal that may provide additional insights or specific fixes related to this error.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for system configuration and landscape management.
  SAP Community: Engage with the SAP Community forums for discussions and solutions shared by other users who may have encountered similar issues.
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance, providing them with detailed logs and error messages for better diagnosis.
  
  By following these steps, you should be able to resolve the error message 2Q001 and successfully configure your SAP system.