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Event ID: 603 Source: TN3270Server

Source
Level
Description
TN3270(E) session with client at TCP/IP Address (port port number) using LU LU Name terminated abnormally because:
TN3270E Service Error 520
Internal LU session state error in FirstInboundByteProcess.
State error id - 3 (expected CONT,RCV).
Current state - SSCP-LU, SNDNXMT.
Comments
 
This event is logged when a TN3270 session ends because of inactivity. See ME908232 for a hotfix applicable to Microsoft Host Integration Server 2004.
See ME814166 and ME822830 for two hotfixes applicable to Microsoft Host Integration Server 2000.

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