You probably have more people coming in via TN3270 than it has available 3270
virtual terminals defined. The parameters in the TN3270 server list, perhaps
generically, VTAM LUs that it can use for TN3270 emulation. Once all of them
are in use, no more TN3270 connections can be made until someone else
disconnects from the TN3270 server and so frees up an LU. The TN3270 server has
parameters. Examples from my z/OS 1.10 system:
TELNETPARMS
PORT 3023 ;
CODEPAGE ISO8859-1 IBM-1047
FULLDATATRACE
INACTIVE 28800
PRTINACTIVE 600
TIMEMARK 600
SCANINTERVAL 120
SMFINIT TYPE119
SMFTERM TYPE119
LUSESSIONPEND
; Define logon mode tables to be the defaults shipped with the
; latest level of VTAM
TELNETDEVICE 3278-2-E NSX32702
TELNETDEVICE 3279-2-E NSX32702
TELNETDEVICE 3278-3-E NSX32703
TELNETDEVICE 3279-3-E NSX32703
TELNETDEVICE 3278-4-E NSX32704
TELNETDEVICE 3279-4-E NSX32704
TELNETDEVICE 3278-5-E NSX32705
TELNETDEVICE 3279-5-E NSX32705
; WLMCLUSTERNAME TN3270E ENDWLMCLUSTERNAME
ENDTELNETPARMS
BEGINVTAM PORT 3023
; Define the LUs to be used for general users.
DEFAULTLUS
DCCVDTAA..DCCVDTAZ..FFFFFFAA
ENDDEFAULTLUS
LINEMODEAPPL TSO ; Send all line-mode terminals directly to TSO.
ALLOWAPPL TSO* DISCONNECTABLE ; Allow all users access to TSO
; applications.
; TSO is multiple applications all beginning with TSO,
; so use the * to get them all. If a session is closed,
; disconnect the user rather than log off the user.
ALLOWAPPL * ; Allow all applications that have not been
; previously specified to be accessed.
; Map Telnet sessions from this node to display USSTXBSC screen.
USSTCP USSTXBSC
;
ENDVTAM
The above requires a VTAM defination for LUs DCCVDTAA..DCCVDTAZ - 26 LUs. We do
this with a major VTAM node similar to:
D08ACCES VBUILD TYPE=APPL APPLICATION MAJOR NODE
*
D08VDTA? APPL ACBNAME=DCCVDTA?, TCP/IP VIRTUAL TERMINAL DEFINITION +
MODETAB=MODETABP, +
VPACING=1,AUTH=(VPACE),EAS=10
This is a very stripped down example. But the 27th attempted concurrent
connections would get your message because all the 3270 LUs are in use.
--
John McKown
Systems Engineer IV
IT
Administrative Services Group
HealthMarkets(r)
9151 Boulevard 26 * N. Richland Hills * TX 76010
(817) 255-3225 phone *
[email protected] * www.HealthMarkets.com
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> -----Original Message-----
> From: IBM Mainframe Discussion List
> [mailto:[email protected]] On Behalf Of jagadishan perumal
> Sent: Wednesday, April 06, 2011 2:14 AM
> To: [email protected]
> Subject: No LUs available
>
> Hi,
>
> In our shop many users are not able to connect the Mainframe.
> While doing
> telnet they get an error saying " NO LUs available please try
> again later".
> we have checked the TSO region and it is very well running.
>
> Any idea to resolve.
>
> Regards,
> Jags
>
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