Messages in VTAM are:
11.42.31 IST663I INIT OTHER REQUEST FAILED , SENSE=08210002 11.42.31 IST664I REAL OLU=FBSNET1.TPXTS0A REAL DLU=FBSNET1.TSOC 11.42.31 IST889I SID = CF6B19021EEA7F60 11.42.31 IST264I REQUIRED LOGMODE NAME T3278MDE UNDEFINED 11.42.31 IST314I END
Check for errors in VTAM.
If the logmode name in the error is T3278MDE, this is the dynamic logmode introduced in TPX 5.3. MDE was added in 5.3 to support the ability for TPX to pass a dynamic logmode to the application. It is included in the delivered logmode tables: TPXLGMOD, TPXLGMD2, TPXLGMD3, TPXLGMD4, and TPXLGMD5.