I suspect the LOGON clist is different between the 2 images. Check the parm 
field of the logon proc.
In particular, the logon clist on LPAR1 is different than LPAR2 (content, not 
name). 

The LPAR1 clist probably creates a dataset if not present.  The LPAR2 clist 
does not.
This may also be due to  a "lpar specific" clist higher in the concat.
e.g. SYS1.LPAR.CLIST 
         SYS1.SYSPLEX.CLIST

HTH,

<snip>
We have 2 systems in a basic sysplex, sharing everything: RACFDB, JES2, Master 
catalog, Parmlibs etc.  The only differences between the sytems is that they 
are each on a different CEC,  and one system has a few licensed products that 
the other doesn't such as MQ, Syncsort,  Qwikref.

We define a new user to RACF,  and all options defined on TSO segment.  New 
user can logon to system 1 successfully.  Then logon to system 2 successfully.  
Everybody is happy.  If the new user tries to log onto system 2 *first*  the 
logon fails with:

....snippage 

IF the user goes back and logs onto system #1,  it is successful.  THen back to 
system #2,  now it's successful too.

There are very few differences between these systems.  Everyone uses RACF for 
TSO logon, the only thing in uads is IBMUSER0.  SYS1.UADS is catalogged in the 
shared master catalog on a different volume,  Z13RES is the currently IPLed 
sysres volume.  MSTJCL00 contains:

//SYSUADS DD DSN=SYS1.UADS,DISP=SHR

I can't find anywhere uads is referenced by volser,  or ****** or &SYSR1 or 
anyting.  I cannot explain why initial logon works on one system and not the 
other.  Does anybody have ideas of what else to check?  I've about run out of 
things to look at.
</snip>

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