01A

Explanation
The system found a problem during TSO/E LOGON processing.
The following hexadecimal reason codes provide further information
about the error: Code
Explanation
04
The LOGON RACF interface
routine received an incorrect function type.
08
The RACROUTE macro received incorrect parameters for storing logon
information in the RACF® data
base.
10
The RACROUTE macro received incorrect parameters for obtaining
logon information from the RACF data
base.
18
The RACROUTE macro returned an incorrect segment length.
1C
The LOGON panel load module IKJLPxxx (xxx is the 3-character code
for the language in which the panel is written) is in error. The variable
recording area (VRA) contains the LOGON panel address and the offset
being accessed in the panel.
20
The LOGON command detected an error in data supplied by either
installation exit IKJEFLN1 or installation exit IKJEFLN2. The VRA
will contain the parameter number and the parameter entry in error.
24
The LOGON command detected an error in validated data.  One of
the following is true: Either installation exit IKJEFLN1 or installation exit IKJEFLN2
validated a field by setting the key to X‘04’.  The LOGON
processor has found that this value is not valid.  For example, one
of the exits may have validated the new password field. However, on
the RACROUTE REQUEST=VERIFY that is done by LOGON, RACF may reject the password.
Either installation exit IKJEFLN1 or installation exit IKJEFLN2
changed the key of a field that was already validated (the key was
X‘04’).
Either installation exit IKJEFLN1 or installation exit IKJEFLN2
requested that the LOGON processor prompt the user for a field that
has already been validated (the key is X‘04’).

 The VRA contains the LOGON panel field number and the parameter
entry in error.
28
The LOGON help text load module IKJLHxxx (xxx is the 3-character
code for the language in which the help text is written) is in error.
The VRA will contain the LOGON help panel address and offset being
accessed in the panel.
2C
Either installation exit IKJEFLN1 or installation exit IKJEFLN2
validated the account number field on the LOGON panel for a user defined
only in the UADS data set, but the exit did not supply a procedure
name.

System action
The system ends the TSO/E LOGON attempt. The system
writes an ABEND dump.

Operator response
Notify the system programmer.

System programmer response
If the problem recurs and if the program
is not in error, search problem reporting data bases for a fix for
the problem. If no fix exists, contact the IBM® Support Center.

Source
Time Sharing Option Extensions (TSO/E)