How To Fix SIAG_MSG644 - PAM ID &1 already logged on by &2

SAP Error Message - Details

• Message type: E = Error

• Message class: SIAG_MSG - GRC Plug-Ins message class

• Message number: 644

• Message text: PAM ID &1 already logged on by &2

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message SIAG_MSG644 - PAM ID &1 already logged on by &2 ?

  The SAP error message SIAG_MSG644 indicates that a user (identified by PAM ID &1) is already logged on to the system by another user (identified by &2). This typically occurs in environments where multiple sessions or connections are not allowed for the same user ID.
  Cause:
  
  Multiple Sessions: The user is trying to log in while already having an active session in the system.
  Session Timeout: The previous session may not have been properly terminated, leading to the user being considered still logged in.
  User Locking: The system may have restrictions that prevent the same user from logging in multiple times, which is common in certain configurations for security reasons.
  
  Solution:
  
  Log Out from Other Sessions: If the user is logged in from another session, they should log out from that session before attempting to log in again.
  Session Management: Check the system for active sessions of the user. An administrator can use transaction codes like SM04 or AL08 to view active user sessions and terminate any unnecessary ones.
  Timeout Settings: Review and adjust session timeout settings if necessary, to ensure that sessions are properly closed after a period of inactivity.
  User Locking Configuration: If the system is configured to prevent multiple logins for the same user, consider whether this policy needs to be adjusted based on user requirements.
  
  Related Information:
  
  Transaction Codes: 
  
  SM04: Display Users Logged On
  AL08: Display All Users Logged On
  
  
  User Management: Administrators can manage user sessions and check for any locks or issues related to user accounts.
  SAP Notes: Check SAP Notes for any specific patches or updates related to this error message, as there may be known issues or fixes provided by SAP.
  
  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.