I did some checking of our CLIST libraries, and found a CLIST which changes the 
TSO PROFILE setting.  The user says she uses that CLIST quite often.  

Thanks for your help everybody!




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On Monday, March 4th, 2024 at 10:21 AM, Lennie Bradshaw 
<[email protected]> wrote:

> The TSO prefix is stored in an unprotected control block (the ECT I think). 
> As such, almost any program running in the TSO session can change it. I don't 
> think that any of RACF, ACF2 or TSS can protect you against that.
> 
> Lennie
> -----Original Message-----
> From: IBM Mainframe Discussion List [email protected] On Behalf Of 
> Steve Beaver
> 
> Sent: 04 March 2024 15:09
> To: [email protected]
> Subject: Re: Changes to user's TSO PROFILE
> 
> Is there anything that tracks changes to a TSO user's PREFIX? I have a user 
> who says her PREFIX keeps getting changed to NOPREFIX.
> 
> RACF, ACF2, TSS
> 
> Regards,
> 
> 
> Steve
> 
> 
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> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:[email protected]] On 
> Behalf Of Jousma, David
> Sent: Monday, March 4, 2024 8:48 AM
> To: [email protected]
> Subject: Re: Changes to user's TSO PROFILE
> 
> Is she logging off cleanly? Or is she letting her session 522 off. If the 
> latter profile changes don’t get written out and would explain the behavior.
> 
> Dave Jousma
> Vice President | Director, Technology Engineering
> 
> 
> 
> 
> 
> From: IBM Mainframe Discussion List [email protected] on behalf of 
> rpinion865 [email protected]
> 
> Date: Monday, March 4, 2024 at 9:40 AM
> To: [email protected] [email protected]
> 
> Subject: Changes to user's TSO PROFILE
> Is there anything that tracks changes to a TSO user's PREFIX? I have a user 
> who says her PREFIX keeps getting changed to NOPREFIX. Sent with Proton Mail
> 
> 
> Is there anything that tracks changes to a TSO user's PREFIX? I have a user 
> who says her PREFIX keeps getting changed to NOPREFIX.
> 
> 
> 
> Sent with Proton Mail secure email.
> 
> 
> 
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