Groan, I hate it to correct myself, but I was contacted offlist that I'm wrong 
... ouch, so early in 2015! ...

So here goes ... 

>>SSHD doesn't tell me that "0123456789" is unknown to RACF, or even that it's 
>>syntactically invalid.  I can't use SSH to probe for known user IDs.

>I believe this is WAD. RACF won't tell you via TSO/SSHD *why* your logon is 
>rejected, it simply says your attempt is invalid.
>That topic of not telling the reason of failed logon was covered in RACF-L in 
>the past.

Should be this:

I believe this is WAD for SSHD, but somewhat different for TSO for passwords, 
not for TSO ids. 

For passwords - RACF won't tell [1] you via *why* your logon is rejected, it 
simply says your password is invalid. (syntax rules/re-used passwords, etc.) 

For TSO, you can probe for known user ids, but you will see a lot of LOGON and 
IEA989I message in the SYSLOG.

That topic of not telling the reason of failed logon (password) was indeed 
covered in RACF-L in the past.

Sorry Paul.

Groete / Greetings
Elardus Engelbrecht

[1] - But, you can see the actual reasons for invalid password in RACF SMF 
records.

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