How To Fix TR900 - Upgrade still running: Logon not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: TR - Change and Transport System

• Message number: 900

• Message text: Upgrade still running: Logon not possible

What causes this issue?

The system is locked for an upgrade.

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?

Log on again later.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TR900 - Upgrade still running: Logon not possible ?

  The SAP error message "TR900 Upgrade still running: Logon not possible" typically occurs when a system upgrade or maintenance task is in progress. During this time, the system is locked to prevent any new logins, ensuring that the upgrade process can complete without interference.
  Cause:
  
  Ongoing Upgrade: The most common cause is that an upgrade (e.g., a kernel upgrade, support package upgrade, or system refresh) is currently being executed.
  System Lock: The system is in a state where it is not accepting new user logins to maintain data integrity during the upgrade process.
  Incomplete Upgrade: If the upgrade process was interrupted or did not complete successfully, the system may remain in a locked state.
  
  Solution:
  
  Wait for Completion: The simplest solution is to wait until the upgrade process is completed. You can check the status of the upgrade in the system logs or by contacting the system administrator.
  Check Upgrade Logs: If you have access, check the upgrade logs (usually found in the DIR_TRANS directory) to see if there are any errors or if the upgrade is still in progress.
  System Administrator: Contact your SAP Basis administrator or the person responsible for the upgrade. They can provide information on the status of the upgrade and whether it is safe to log in.
  Restart the Upgrade: If the upgrade has failed or is stuck, the Basis team may need to restart the upgrade process or resolve any issues that caused the interruption.
  System Configuration: Ensure that the system configuration is correct and that all prerequisites for the upgrade have been met.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to your specific version and upgrade type for any known issues or additional troubleshooting steps.
  Transaction Codes: Use transaction codes like SM21 (System Log) or ST22 (Dump Analysis) to check for any related errors that might provide more context.
  Documentation: Refer to the official SAP upgrade documentation for guidelines on how to properly execute and monitor upgrades.
  
  If the issue persists after following these steps, further investigation may be required, and it may be necessary to involve SAP support for assistance.