I've faced this error when I was trying to connect an ERP system with an EHS-GLM server and was stuck a couple of days:
T:15060 Error in program 'C:\WWI\WwiSvcU.EXE': ======> CPIC-CALL: 'SAP_CMACCPTP : rc=6
LOCATION SAP-Gateway on host ERP_HOSTNAME.local / sapgw13
ERROR registration of tp WWI-Labeling from host EHS_HOSTNAME.DOMAIN.local not allowed.
T:16036 Error in program 'Dummy': ======> CPIC-CALL: 'SAP_CMACCPTP : rc=6
LOCATION SAP-Gateway on host ERP_HOSTNAME.local / sapgw13
ERROR registration of tp EHS_MANSRV_SID from host EHS_HOSTNAME.DOMAIN.local not allowed
Therefore my RFCs in ERP system are unsuccesful with the error : ERROR: program EHS_MANSRV_SID not registered.
The solution is adding a single parameter : gw/acl_mode=0 . Even it was not determined by RZ10 as a parameter, I insisted to set it with its default value!