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

SIAG_MSG644 - Overview

• 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.

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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