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

TR900 - Overview

• 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.

TR900 - Details

• 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