SAP SNC setup for SmartExporter

[lek23]

I am using SmartExporter to connect with SAP SNC, I set up self signed certificates and exchange between SAP and App server already but when test connection I got below error

Can you please advise what would be root case here?

here is error log

Wednesday, November 22, 2023 5:17:29 PM

Last connection test resulted in error:
RfcOpenConnection failed(RFC_COMMUNICATION_FAILURE): 
LOCATION    CPIC (TCP/IP) on local host with Unicode
ERROR       GSS-API(maj): No valid credentials provided (or available)
            GSS-API(min): SSPI::IniSctx#1()==No credentials available in
            security 
            Could't acquire DEFAULT INITIATING credentials
TIME        Wed Nov 22 17:17:29 2023
RELEASE     753
COMPONENT   SNC (Secure Network Communication)
VERSION     6
RC          -4
MODULE      D:/depot/bas/753_REL/src/krn/snc/sncxxall.c
LINE        1465
DETAIL      SncPAcquireCred
SY