Error
Error Code:
1024
SAP S/4HANA Error 1024: Session Disconnected or Invalidated
Description
Error 1024, identified as ERR_SES, indicates that your active SAP S/4HANA user session has become invalid or disconnected. This typically occurs due to inactivity, network interruptions, or client-side issues, preventing further interaction with the system.
Error Message
ERR_SES
Known Causes
4 known causesSession Timeout
The user session has expired due to a period of inactivity, automatically terminating the connection for security reasons.
Network Connectivity Loss
A temporary or prolonged loss of network connection between your device and the SAP S/4HANA server can invalidate the active session.
Browser or Client Glitch
Issues with your web browser (e.g., cache, cookies) or the SAP GUI client can sometimes corrupt or prematurely terminate the session.
Server-Side Termination
The session might have been terminated by an administrator, a system restart, or another unexpected server-side event.
Solutions
4 solutions available1. Restart SAP Gateway Service easy
A common cause is an unresponsive SAP Gateway, which can be resolved by restarting its service.
1
Access the SAP system using SAP GUI. Navigate to transaction SMGW (Gateway Monitor).
2
From the Gateway Monitor menu, select 'Goto' -> 'Expert Functions' -> 'Trouble Shooting' -> 'Restart Gateway'.
3
Confirm the restart action if prompted. Monitor the Gateway status to ensure it comes back online.
2. Verify and Adjust Gateway Timeout Parameters medium
Incorrectly configured timeout parameters can lead to premature session invalidation.
1
Access the SAP system using SAP GUI. Navigate to transaction RZ11 (Parameter Maintenance).
2
Enter the parameter name `gw/acl_mode` and press Enter. Check its value. A value of '1' or '2' is generally recommended for security. If it's set to '0', consider updating it to '1' or '2' after understanding the security implications.
3
Enter the parameter name `gw/connect_timeout` and press Enter. This parameter defines the timeout for establishing a connection to the gateway. Ensure it's set to a reasonable value (e.g., 10-30 seconds).
4
Enter the parameter name `gw/disconnect_timeout` and press Enter. This parameter defines the timeout for disconnecting from the gateway. Adjust if necessary, but be cautious not to set it too low.
5
If changes are made, activate the parameters. This usually requires a gateway restart (refer to Solution 1) for the changes to take full effect.
3. Check Network Connectivity and Firewall Rules medium
Intermittent network issues or blocked ports can cause the SAP Gateway to lose connection.
1
From the client machine experiencing the error, attempt to ping the SAP application server hostname or IP address.
ping <SAP_APPLICATION_SERVER_HOSTNAME_OR_IP>2
Verify that the SAP Gateway port (default 33xx, where xx is the SAP instance number) is open and accessible from the client to the SAP application server. Use `telnet` or `nc` (netcat) for testing.
telnet <SAP_APPLICATION_SERVER_HOSTNAME_OR_IP> <SAP_GATEWAY_PORT>3
If the port is blocked, work with your network administrator to update firewall rules on both the client and server sides to allow traffic on the SAP Gateway port.
4
Check for any network device (e.g., routers, switches) that might be dropping connections due to inactivity or exceeding session limits. Consult with your network team.
4. Analyze Gateway Trace and System Logs advanced
Detailed analysis of gateway traces and system logs can pinpoint the root cause of session invalidation.
1
Access the SAP system using SAP GUI. Navigate to transaction SMGW (Gateway Monitor).
2
Under 'Goto' -> 'Trace', enable gateway tracing. Start with a 'Standard' or 'Verbose' level depending on the issue's complexity. This will generate trace files in the SAP application server's work directory.
3
Simultaneously, review the SAP application server's system log (transaction SM21) for any related error messages occurring around the time of the ERR_SES error.
4
Access the operating system of the SAP application server. Navigate to the work directory (usually `/usr/sap/<SID>/<INSTANCE>/work/`). Examine the generated gateway trace files (e.g., `dev_rd`).
5
Look for specific error messages, connection failures, or timeout indications within the trace files and SM21. These will provide clues about whether the issue is related to network, client-side problems, or SAP internal processes.
6
If the issue persists, consider increasing the gateway trace level to 'Debug' for more detailed information, but remember to deactivate it afterward to avoid excessive disk space usage.