John, 
tell me, what's the common denominator, the thing that's special with the
failing logonIDs? In other words, what's different when compared to a
logonID that works? 
Logon proc? 
Dataset allocation accessing obsolete / backlevel version of software?
Startup Clist/Exec? 
Personal customization? 
Homegrown commands with a dependency on JES2 level (that need recompiling)?
Is SDSF up to speed?

When the S0C1 occurs, does the session just fail or does it recover? Did you
get a SYSUDUMP to look at?
Did you try a simple, more generic SLIP to trap any S0C1 occurrence?


Regards,
Ulrich Krueger

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf
Of John C. Wolf
Sent: Monday, November 26, 2007 10:09
To: [email protected]
Subject: branching to zero

I have a problem with some TSO users getting 0C1s at logon.
It appears that some module is branching to zero but I can't find it.
I set a IF slip for range 0 to 10 but it will not spring.
I did install a new version of JES2 V1R7 on Friday but only  a few TSO users

have this problem.
Does any one have any ideas on how to shoot this problem.

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