Assembly / HLASM · Abend code
What does System Completion Code S622 mean in Assembly / HLASM?
A TSO task ended because of an unconditional logoff — the terminal session was disconnected, the user pressed ATTN during LOGON scheduling, a control-block construction error occurred while setting up the session, or (very commonly today) a TN3270 gateway dropped the connection for inactivity.
A TSO task ended because of an unconditional logoff — the terminal session was disconnected, the user pressed ATTN during LOGON scheduling, a control-block construction error occurred while setting up the session, or (very commonly today) a TN3270 gateway dropped the connection for inactivity.
Check the TN3270/telnet server logs for a connection-drop-on-inactivity entry around the failure time, and if legitimate long-idle sessions are being cut off, raise the inactivity timeout on the terminal emulation gateway rather than blaming TSO itself.