The Change DDM TCP/IP Attributes (CHGDDMTCPA) command provides an interface to configure parameters for the use of DDM or DRDA over TCP/IP.

Restrictions:

*IOSYSCFG special authority is needed to use this command.

Parameters

Keyword	Description	Choices	Notes
AUTOSTART	Autostart server	*NO, *YES, *SAME	Optional, Positional 1
PWDRQD	Password required	*NO, *YES, *ENCRYPTED, *VLDONLY, *KERBEROS, *SAME	Optional

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Autostart server (AUTOSTART)

Specifies whether to automatically start the DDM server when TCP/IP is started by the Start TCP/IP (STRTCP) command. The parameter takes effect the next time the STRTCP command is run. It also causes the DDM server to start when selected TCP/IP servers are started with the STRTCPSVR SERVER(*AUTOSTART) command.

The possible values are:

*SAME

The value does not change.

*YES

Start the DDM TCP/IP server.

*NO

Do not start the DDM TCP/IP server when starting TCP/IP, or when running the STRTCPSVR SERVER(*AUTOSTART) command.

Password required (PWDRQD)

Specifies the minimum level of password security required when a client system connects to this system as a server. This parameter takes effect on the next DRDA or DDM connect request over TCP/IP.

The possible values are:

*SAME

The value does not change.

*YES

Refuse the connection if a DDM connection request does not contain a password associated with the userid.

*NO

Do not require a password on a DDM connection request. If a password is sent, it is ignored. See also *VLDONLY description.

*ENCRYPTED

Require the sending of an encrypted password along with the userid by a remote client system attempting to connect.

*VLDONLY

Do not require a password on a DDM connection request. If a password is sent, however, it must be valid for the associated userid.

*KERBEROS

Authentication occurs using Kerberos.

Examples

Example 1: Displaying the Change DDM TCP/IP Attributes Display

CHGDDMTCPA

This command, when prompted, shows the current DDM TCP/IP attribute values.

Example 2: Starting the DDM TCP/IP Server Automatically

CHGDDMTCPA   AUTOSTART(*YES)

This command indicates that the next time TCP/IP is started by the STRTCP command, the DDM server is to be started automatically.

Example 3: Allowing DDM TCP/IP Connection Requests to be Accepted if They Contain at Minimum a Userid with No Password.

CHGDDMTCPA   PWDRQD(*NO)

This command indicates that on the next DDM TCP/IP connection request, a password will not be required in order to initiate the connection.

Error messages

*ESCAPE Messages

CPF3EC6

Change DDM TCP/IP attributes failed.