The following options are required in the user directory on the server:
MACHINE XC
IUCV ALLOW
You can also include the following:
IUCV ANY
OPTION MAXCONN 256 APPLMON
Because of limitations in z/VM, the server cannot query the IUCV ALLOW or IUCV ANY options in the directory. However, if the maximum number of IUCV paths (MAXCONN value) is 256 or higher, these options are probably enabled. If the setting is less than 256, a warning message will be issued to the server console, and the server will continue to startup.
Although the MAXCONN value can be as high as 64K, memory for the connections is reserved at IPL time, so it is a good idea to determine the number of connections you are likely to need before setting this value.
The maximum number of connections specified by the MAXCONN option in the directory determines the maximum number clients that can connect to the sink machine.
The following is a simple user directory that has the required options as well as an ACIGROUP entry of QCS. For information on ACIGROUP, see Security Considerations:
USER QCSUSR ******** 64M 256M GDJ 64
*PW= 08/05/09
*ED= 08/07/13 08:00:24 VMXSYSAD EDIT 97/07/15
*FL= *
*LA= 11:23:25 EST Thursday 11/17/05 by REXECD
*LL= 14:14:24 EDT Wednesday 07/16/08 from 172.30.244.55
SCREEN INAREA DEFAULT NONE STATAREA DEFAULT NONE CPOUT DEFAULT NONE
SCREEN VMOUT DEFAULT NONE INREDISP DEFAULT NONE
ACCOUNT QCS 29FLOOR
MACHINE XC
ACIGROUP QCS
IPL CMS PARM AUTOCR
IUCV ALLOW
CONSOLE 009 3215 A
MDISK 191 3390 4912 60 USRLAB MR
LINK QCSSYS 192 292 RR
* OWNER = John Smith
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