Dynamically changing TCPIP.DATA statements

You can use the MODIFY RESOLVER,REFRESH command to change some of the TCPIP.DATA statements being used by a long-running TCP/IP application (for example, a server application). To do this, follow either of the following procedures.

Restrictions: You cannot change the TCPIP.DATA statement values for the following subset of TCP/IP provided applications:

SMTP server
DNS utility z/OS® UNIX commands (nslookup, onslookup and dig)
Any application program that uses the Language Environment® C/C++ res_ API facilities and changed the updated TCPIP.DATA statement

Table 1 lists the TCPIP.DATA statements and whether each statement can be dynamically changed (refreshed). For more information about modifying statements, see z/OS Communications Server: IP System Administrator's Commands and to z/OS Communications Server: IP Configuration Guide for information about configuring resolvers.

Table 1. Refreshable TCPIP.DATA
TCPIP.DATA statement	Refreshable
ALWAYSWTO	No
DATASETPREFIX	No
DOMAINORIGIN or DOMAIN	Yes
HOSTNAME	No
LOADDBCSTABLES	No
LOOKUP	Yes
MESSAGECASE	No
NOCACHE	Yes
NSINTERADDR or NAMESERVER	Yes
NSPORTADDR	Yes
RESOLVEVIA	Yes
RESOLVERTIMEOUT	Yes
RESOLVERUDPRETRIES	Yes
SEARCH	Yes
SOCKDEBUG	No
SOCKNOTESTSTOR	No
SOCKTESTSTOR	No
SORTLIST	Yes
TCPIPJOBNAME or TCPIPUSERID	No
TRACE RESOLVER	Yes
TRACE SOCKET	No
OPTIONS DEBUG	Yes
OPTIONS NDOTS	Yes
; or # (COMMENT)	NA