APPC problem after upgrading from TSSMVS r15.0 to r16.0.

Document ID : KB000077356
Last Modified Date : 12/04/2018
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Question:
Access to APPC fails with: ======================================================================================== 27/03/18 16:30:20 XMVS *MISSING APPC APW ATBFMFPE *1C*-03 INI *MISSING 27/03/18 16:30:20 XMVS *MISSING APPC APW ATBFMFPE *08*-07 INI ** UNDEFINED ACID ** ======================================================================================== 
Answer:
VTAM member changed from:
=====================================
VBUILD TYPE=APPL
NPFIRCO APPL ACBNAME=NPFIRCO,
APPC=YES,
...
SECACPT=CONV,
=====================================
...to:
=====================================
VBUILD TYPE=APPL
NPFIRCO APPL ACBNAME=NPFIRCO,
APPC=YES,
...
SECACPT=ALREADYV,
=====================================
...as per IBM information: https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.istrdr0/appsec.htm ======================================================================================SECACPT=CONV - Specifies that this logical unit supports conversation requests containing access security subfields. SECACPT=ALREADYV - Specifies that this logical unit supports conversation requests containing access security subfields. The logical unit also accepts the already-verified indications that it receives in conversation requests from partner LUs. ====================================================================================== ...also, in TSSMVS:
1.) Define the ACID 'APPC', making sure it has both Facilities, 'STC' and 'APPC'.
2.) Define the Started Task.
3.) Define the MASTFAC.
4.) Re-cycle APPC.
Additional Information:
IBM information:
htps://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.istrdr0/appsec.htm