TN3270E Service Error 503 - Session Dropped Due to Inactivity

ID: Q166845

The information in this article applies to:

Microsoft SNA Server, versions 2.11, 2.11 SP1, 2.11 SP2, 3.0, 3.0 SP1

SUMMARY

The SNA Server TN3270 Server configuration includes an Idle Timeout parameter which causes the server to disconnect a TN3270 client session after the session has been inactive for the idle timeout period. The idle timeout period defaults to 120 minutes or 2 hours.

When the Idle Timeout expires for a TN3270 client session, the TN3270 server drops the client's SNA session and sends the following message to the TN3270 client to display to the user:

TN3270E Service Error 503
Session terminated due to inactivity.

When this occurs, the TN3270 Server will also report the following event to the Windows NT Server Event Viewer Application log:

Event ID: 603
Source: TN3270 Server
Description:
TN3270(E) session with client at <client IP address and port> using
LU <luname> terminated abnormally because:

TN3270E Service Error 503
Session terminated due to inactivity

NOTE: Event ID 603 can occur for a variety of reasons. Service Error 503 is a specific cause for an abnormal session termination caused only by the TN3270 Server's idle timeout parameter.

MORE INFORMATION

The TN3270 Server Idle Timeout parameter can be set from 1 minute to 1440 minutes (or 1 day). Here are instructions for setting this parameter:

If you are using SNA Server 2.11 (or 2.11 service pack 1 or 2), run the TN3270 Service Admin program and choose the <Options> button.

If you are using SNA Server 3.0 (or 3.0 service pack 1), run the SNA Server Manager program, right-click on the TN3270 Server, choose the Properties button, and choose the Settings folder.

Additional query words:

Keywords : prodsna snatn3270
Version : WINDOWS:2.11,2.11 SP1,2.11 SP2,3.0,3.0 SP1
Platform : WINDOWS
Issue type :