IBM Mainframe Forum

Hello,
I am using z/OS 1.9.
Issue: Iam able to login to one TSO session, but when I try to open another (Second TSO session) the error message "IKT00204I LOGON FAILED, NO USER APPLID AVAILABLE" is thrown.
(Error message on Console: "IKT011I TCAS UNABLE TO ACCEPT LOGONS, REASON CODE = 100").
Logged in to APPLTSOxx(Major node) in VTAMLST to see if enough APPLIDs are defined, and yes it is, and all other APPLIDs except the one created for the first logon are in CONCT Status.
Also confirmed USERMAX parameter in IEASYSxx & TSOKEYxx member of PARMLIB, and the Max users specified are 500 & 100

We also tried to use below cmd on TSO session for logging in
"LOGON APPLID(TSO0002)"

For reference I am also attaching my APPLTSO major node definition.

***************************************************************
* TSO VTAM APPLICATION DEFINITIONS
***************************************************************
TSTTSO APPL AUTH=(NOACQ,NOBLOCK,PASS,NOTCAM,NVPACE,TSO,NOPO), X
MODETAB=DSVMODE,ACBNAME=TSO
TSTTSO01 APPL AUTH=(NOACQ,NOBLOCK,PASS,NOTCAM,NVPACE,TSO,NOPO), X
MODETAB=DSVMODE,ACBNAME=TSO0001
TSTTSO02 APPL AUTH=(NOACQ,NOBLOCK,PASS,NOTCAM,NVPACE,TSO,NOPO), X
MODETAB=DSVMODE,ACBNAME=TSOM002
TSTTSO03 APPL AUTH=(NOACQ,NOBLOCK,PASS,NOTCAM,NVPACE,TSO,NOPO), X
MODETAB=DSVMODE,ACBNAME=TSO0003
TSTTSO04 APPL AUTH=(NOACQ,NOBLOCK,PASS,NOTCAM,NVPACE,TSO,NOPO), X
MODETAB=DSVMODE,ACBNAME=TSO0004
TSTTSO05 APPL AUTH=(NOACQ,NOBLOCK,PASS,NOTCAM,NVPACE,TSO,NOPO), X
MODETAB=DSVMODE,ACBNAME=TSO0005


Regards
Saurabh Khandelwal

Hello,

Suggest you talk with your system support. Many systems do not permit multiple concurrent tso logins.

I'm not sure VTAM supports multiple occurrences of an applid being active on a single terminal at the same time. Talking to your site support group, as Dick suggested, is definitely the way to find out for sure.