Jake,
Some additional details will help

Are you using a session manager?
Are you logging on with an APPL (LOGON APPL(xxxx) ) command?

Have you verified your definitions for the two lpars are set up correctly?  Did 
you code LPAR1 Appl for LPAR2 and so forth?

Please provide a display of your session definitions for TSO
D NET,ID=xxxxxxxx,E

You need to make sure all of your connection definitions are correct first 
before looking to MIM.  I am not aware of how MIM might affect a logon.

A Session manage could affect your logon.

If all connections are correct, then check how your TSO environment is set up.  
Are your ISPF datasets (like PROFILE) unique?  Do you have a logon CLIST/REXX 
that allocates unique files?

Did  you logon to LPAR2 and forget to logoff when you tried to logon to LPAR1?



Lizette

> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:[email protected]] On
> Behalf Of Jake Anderson
> Sent: Thursday, July 14, 2016 4:38 AM
> To: [email protected]
> Subject: Already logged on message - Wrong System ID
> 
> Hello,
> 
> I am trying to access one of an LPAR1 within a sysplex. Where I get a message
> as you already logged on to LPAR1. When I have someone to check my ID from
> other system its shows that My ID is active in LPAR2.
> 
> We have MIM but we have not enabled Parallel Logon facility serialization.
> 
> I am curious why z/OS is displaying a wrong System Name instead of the One my
> ID is active ?
> 
> Its like I am logged into LPAR2, but when I try accessing LPAR1, it shows that
> you are already logged on to LPAR1..
> 
> This gets resolved after My ID is cancelled from LPAR 2.
> 
> Are there any EXITS or REXX which can tell me the correct System Name when I
> try to logon to other LPAR within the same sysplex(Shared RACF and no MIM
> serialization).
> 
> Did any of you face this kind of situation and found a remedy ?(Here in our
> MIM serialization for IKJUA IS not allowed)
> 
> 
> 
> Jake
> 

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