00155 - User already logged on at another terminal

SAP Error Message - Details

• Message type: E = Error

• Message class: 00 -

• Message number: 155

• Message text: User already logged on at another terminal

What causes this issue?

You have tried to logon, but you are already logged on on another
terminal.

System Response

The system does not allow this.

How to fix this error?

Please specify a different user name, or log off the
other terminal.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 00155 - User already logged on at another terminal ?

  The SAP error message "00155 User already logged on at another terminal" indicates that a user is attempting to log into the SAP system while they are already logged in from another session or terminal. This is a common issue in environments where users may have multiple sessions open or are trying to access the system from different devices.
  Cause:
  
  Multiple Sessions: The user has logged into the SAP system from another terminal or session and is trying to log in again.
  Session Timeout: The previous session may not have been properly logged out, or it may still be active due to a timeout setting.
  Network Issues: Sometimes, network issues can cause a session to remain active even if the user has disconnected.
  User Configuration: The user profile may be configured to allow only one session at a time.
  
  Solution:
  
  Log Out from Other Sessions: The user should log out from the other session or terminal where they are currently logged in. This can be done by accessing the other session and performing a logoff.
  Session Management: If the user cannot access the other session, an administrator can terminate the session from the SAP system. This can be done using transaction code SM04 (User Overview) or AL08 (Global User Overview) to find and terminate the user's session.
  Check User Profile Settings: If the user frequently needs multiple sessions, the administrator can check the user profile settings to see if it can be adjusted to allow multiple logins.
  Wait for Timeout: If the user is unable to log out from the other session, they may need to wait for the session to time out, which can take some time depending on the system settings.
  
  Related Information:
  
  Transaction Codes:
  
  SM04: To view and manage user sessions.
  AL08: To view all active user sessions across the system.
  
  
  User Profile Settings: Administrators can check user profiles in transaction SU01 to see if there are restrictions on the number of sessions.
  SAP Notes: There may be specific SAP Notes related to session management and user logins that can provide additional guidance or solutions.
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or refer to SAP support for further assistance.