This document contains frequently asked questions concerning the Natural Development Server (NDV) under SMARTS on BS2000.
The following topics are covered:
Natural Development Server starts and terminates immediately
Trace output shows: Transport initialization failed, EDC8115I address already in use
Characters are not displayed correctly in the terminal emulation of Natural Studio
How do I find out which hexadecimal value must be specified for TABA1/TABA2?
The modifications of TABA1/TABA2 do not apply to sources listed in the remote debugger
Are there any Natural profile parameter settings required for NDV?
The NDV server consumes a lot of CPU time even if only a few clients are using it
At server initialization, the Natural Development Server
allocates central control blocks,
assigns a central logical system file SYSOUT for all
tasks,
obtains the configuration file,
loads the Natural front-end,
initializes the first Natural session and
launches the TCP/IP listener task.
If one of these steps fails, the server will not be able to continue and will terminate immediately.
Analyze the trace output or the error output in the logical system file
SYSOUT to find out the problem.
STGTRACE, STGSTDO, STGSTDE are
synonyms for serveridE,
serveridO and
serveridT.
| SYSOUT | The central logical system file SYSOUT of the FSIO task contains the error and trace output and the content of the configuration file. |
The Natural front-end specified by the NDV configuration parameter
FRONTEND_NAME was
not found in the load library concatenation.
The TCP/IP port number specified by the NDV configuration parameter
PORT_NUMBER
is already in use by another process.
When a Natural Development Server initializes, it starts a Natural
session using the session parameter(s) defined by the NDV configuration
parameter SESSION_PARAMETER.
The profile definition of the NDV configuration parameter
DEFAULT_PROFILE is
appended. If the initialization of the template session fails, the server
terminates immediately. The original error can be found below the message
Error at:Template runtime connect.
Typical error situations could be:
No Natural buffer pool defined.
Natural system file FNAT not accessible.
Natural profile parameter ITERM=ON (Session
Termination in Case of Initialization Error).
NDV initial user ID not defined.
Each client must be defined in Natural Security (NSC) if the
Transition Period Logon flag in NSC is set to NO. Otherwise, your
attempt fails with a NAT0873
error.
You must define an NDV initial user ID (default ID is
STARGATE) unless you run with Natural profile parameter
AUTO=OFF (no automatic logon).
Each user must have either a default library or a private library. Otherwise, your attempt will fail with a NAT1699 error.
You must not specify a startup program that executes an I/O statement
or stacks a LOGON, LOGOFF
or RETURN command, because the program is executed
whenever you change the focus to that library within the tree view.
If you add a new user, you must specify a password for this user. Otherwise, his/her attempt will fail with a NAT0838 error.
SMARTS encountered an irrecoverable error and terminates a worker-task without recovery processing.
Specify session parameter ETID=' '. If you are
using Natural Security, clear the ETID (Adabas User Identification) definition
for that user.
Stub return codes are raised by the NDV front-end stub, if it detects a logical processing error when dispatching the NDV request. The NDV trace output contains detailed information about the reason for the error.
The following stub return codes are possible:
| Code | Meaning, Reason, Action |
|---|---|
1 |
|
2 |
When Natural Studio executes a command, the Natural Development Server allocates an
entry in its session directory and creates a new subtask. If one of these
actions fails, the Stub Reason:
Action:
Increase the value of the SMARTS parameters
|
3 |
This error occurs if a storage allocation for internal NDV control buffers fails due to a lack of virtual memory above 16 MB. Reason:
Virtual memory above 16 MB too small. Action:
Increase the virtual memory above 16 MB by
increasing the value of the SMARTS parameter |
4 |
Internal error. Natural Studio uses an invalid session identifier to process a request. Reason:
Action:
Locate the defective session ID in the server trace file and cancel it using the monitor task, or restart your Natural Studio session. |
5 |
In some situations, a Natural I/O is prohibited at the Natural Development Server. Reason:
Action:
Locate the I/O buffer in the server trace file to find out which I/O should be processed. Check for any startup program specified for the library you want to logon to. |
6 |
Not applicable. |
7 |
The Natural Development Server cannot finish a terminal I/O. Reason:
Action:
Increase the virtual memory above 16 MB by
increasing the value of the SMARTS parameter |
8 |
Internal error, contact Software AG support. |
9 |
Natural Development Server cannot execute the Natural module
Reason:
Action:
Use the Natural utility INPL to load the NDV modules. |
10 |
If you execute a program on the Natural Development Server that
executes a In an online environment, the Natural Security logon screen is
displayed in this situation. Under NDV, the Natural session rejects all
requests except a |
The ASCII-to-EBCDIC translation for NDV uses the Natural translation
tables TABA1/TABA2. These tables are automatically or manually
adapted at the customer's site.
Automatic adaptation of the Natural translation tables
TABA1/TABA2 takes place if the following Natural profile
parameters are set:
CFICU=ON and
CP=value
where value can be any value
except OFF or AUTO.
For further information on possible settings, see the corresponding profile parameter descriptions in the Natural Parameter Reference documentation.
At session initialization (when you map to the NDV server) Natural
automatically adapts its conversion tables TABA1/TABA2 according
to the CP parameter definition and the code page used at
the client. To verify if the conversion tables have been adapted, set NDV
TRACE_LEVEL=31, connect to the NDV host via Natural Studio, and
review the NDV trace file.
Each Map Environment starts with:
11 07:58:02 00000003 Got new connection
some lines down you find:
11 07:58:02 00000005 Client codepage: windows-1252 11 07:58:02 00000005 Client operation = 18
and again some lines down you find:
11 07:58:03 00000005 TABA1/TABA2 adapted according CP definitions
which indicates that the table has been adapted.
The translate tables can be modified as follows:
Modify source member NTTABA1/NTTABA2 on the Natural
distribution library. Reassemble NATCONFG and relink the Natural
nucleus.
Specify the Natural session parameter
TABA1/TABA2.
Manual adaptation requires setting CP=OFF. It also requires
that TERMINAL_EMULATION=WEBIO be off. As a result, you cannot use
the statements REQUEST DOCUMENT and PARSE.
Automatic and manual adaptation are mutually exclusive. If the automatic
adaptation is effective, any TABA1/TABA2 definitions are
discarded. You can use either the automatic or the manual update but not a mix
of both.
Do not use Natural Studio session parameters as an approach to permanently implementing these changes. You run the risk that different clients may use different translations, and this could corrupt source code the clients share. It is better to maintain the translation centrally. You can do this in two different ways:
Maintain the Natural parameter module, or
Use the NDV configuration parameter
SESSION_PARAMETER.
This affects the SPoD users only.
For NDV under BS2000, the translation tables have to be adapted as follows:
| Position | Value | Character |
|---|---|---|
| C4 | BB | Ä |
| D6 | BC | Ö |
| DC | BD | Ü |
| DF | FF | ß |
| E4 | FB | ä |
| F6 | 4F | ö |
| FC | FD | ü |
| Position | Value | Character |
|---|---|---|
| 4F | F6 | ö |
| BB | C4 | Ä |
| BC | D6 | Ö |
| BD | DC | Ü |
| FB | E4 | ä |
| FD | FC | ü |
| FF | DF | ß |
In Natural Studio, see also Tools / Options / Workspace / Terminal emulation setting in Natural Studio. The default (Latin) may not be the correct choice. For instance, in the US, you probably want to select "United States".
A simple Natural program on the mainframe can reveal the EBCDIC representation of a character which is not converting correctly:
#A(A1) = '{'
WRITE #A(EM=H)
END
If none of the available code pages applies to your needs, it is
possible to adapt one of the N3270_USER 3270 translation tables in
the etc directory. Details are in the Natural for
Windows product documentation.
The web-site http://www.tachyonsoft.com/uc0000.htm is a good resource for finding valid EBCDIC and ASCII values for a given character (glyph) in various code pages.
Run the following program on your Natural for Windows locally.
#A(A1) = '{'
WRITE #A(EM=H)
END
Output is 7B.
Run the program on a mainframe (edit the program with the Natural
mainframe editor). Output is 75, assuming that you use a German
EBCDIC table. If you use a US EBCDIC table, the output will be
C0.
Start your Natural Development Server session with
TABA1=(75,7B) and
TABA2=(7B,75).
Specify the NDV configuration parameter
DBG_CODEPAGE=USER.
The following Natural profile parameter values are required for NDV:
ETID=OFF is required to allow multiple Natural sessions
for each client.
DBCLOSE=ON is required to remove database resources
immediately after session termination rather than to keep them until they are
removed due to a timeout.
ITERM=OFF is required to continue with the Natural
Development Server initialization, even if session initialization errors
occur.
AUTO=ON/AUTO=OFF (Automatic Logon) has a different
behavior under Natural Single Point of Development. In an online Natural
environment, this parameter controls whether you are prompted for your user ID
and password or whether your user ID is treated to be a trusted user ID from
the TP environment. With Natural Single Point of Development, you must always
specify your user ID and password in the Map Environment dialog.
The Natural front-end cannot allocate the Natural thread. Increase the
SMARTS SYSPARM parameter THSIZEABOVE.
If you run your NDV server without a CPU time limit on session level, a
Natural program might run into an endless loop. Issue a server command
list sessions and examine whether any of the listed
sessions has the status code "IO" (under the column
header St. in the list output). The character I
means that the client owns an initialized session, and the O flags mean that
the client occupies a thread and is currently executing.
If a second list sessions command results in
an "IO" for the same client with an unaltered Last
Activity, it is probably a stuck or looping client. You can try to cancel the
session using a CANCEL SESSION server command. If
the cancelation fails, a restart of the NDV server is required.
If the list sessions function does not show a
stuck or looping client, cancel the NDV server by using the
DUMP option, and consult Software AG support.
Probably the TCP/IP environment is in error. See the system error message after the error log entry and ask your system programmer(s) for assistance.