The symptoms you are getting sound similar to an old APAR :

PQ45923
Perhaps there has been a regression in the Comm Server code?

Rob Scott

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________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of Rob 
Scott <[email protected]>
Sent: Monday, May 25, 2026 1:46:09 PM
To: [email protected] <[email protected]>
Subject: Re: MXI for zOS 3.1

EXTERNAL EMAIL




That service is not called explicitly from MXI code. It is conceivable that it 
is invoked by the EZASMI service under the covers, however IBM support should 
know for certain.

Rob Scott

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________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of 
Peter <[email protected]>
Sent: Monday, May 25, 2026 8:50:34 AM
To: [email protected] <[email protected]>
Subject: Re: MXI for zOS 3.1

EXTERNAL EMAIL




Hello Rob

Our Systrace of OMVS shows that the BPX1MSS was requested by running key8

On Mon, 25 May 2026, 11:27 Rob Scott, <
[email protected]> wrote:

> MXI 4.3 runs Key8 problem state.
>
> Note that the code has not been changed for over 20 years.
>
> Rob
>
> Sent from Outlook for 
> Android<https://aka.ms/AAb9ysg<https://aka.ms/AAb9ysg><https://aka.ms/AAb9ysg<https://aka.ms/AAb9ysg>>>
> ________________________________
> From: IBM Mainframe Discussion List <[email protected]> on behalf
> of Peter <[email protected]>
> Sent: Monday, May 25, 2026 7:55:45 AM
> To: [email protected] <[email protected]>
> Subject: Re: MXI for zOS 3.1
>
> EXTERNAL EMAIL
>
>
>
>
>
> Hi Brian/All,
>
> IBM viewed the dump where NETSTAT command fails with JRPswKeyNotValid while
> running in key8, somehow the job or user was dubbed before NETSTAT got
> issued by something else running in key6.
>
> On Mon, 25 May 2026, 10:45 Brian Westerman, <
> [email protected]> wrote:
>
> > I think you are probably going to find that the issue is with one of your
> > BPXPRMxx settings that is causing you to have issues when your region
> size
> > isn't large enough to handle things after a "previous" call to a java or
> > BPX service.
> >
> > I think you will find that IBM has several open APARs on that particular
> > issue.
> >
> > Also, you will probably find that if you start TSO and immediately go
> into
> > MXI, that things will be perfectly fine. I have LPARs at RSU 2603
> running
> > both 3.1 and 3.2 with no issues, but I made a lot of BPXPRMxx changes
> that
> > you might have skipped in your install.
> >
> > Brian
> >
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