3435567 - Enterprise Event Enablement - OAuth Connection test for channel failed response 411

When configuring Event Mesh scenario as per SAP Help Creating SM59 Destination for SAP Event Mesh Validation Instance. Testing accessing a token for OAuth using the OA2C_GENERIC_ACCESS the following message is raised: 

>> lcl_oa2c_app->EXECUTE_ATR
granttype Client Credentials configured.

HTTP failure, processing failed, invalid state, invalid timeout or others
oa2c_error
Client configuration error or network problems. See kernel traces.
HTTPC Method:                  RECEIVE
HTTPC Subrc:                       1
HTTPC Subrc Text:              http_communication_failure
HTTPC get_last_error code:       411
HTTPC get_last_error message:
Direct connect to host.authentication.eu10.hana.ondemand.com:443 failed: NIECONN_REFUSED(-10)

• SAP S/4 Hana
• BTP Platform 
  
  

NIECONN_REFUSED(-10), 411, OA2C_GENERIC_ACCESS, Event Mesh Validation Service, http_communication_failure , KBA , BC-SEC-LGN-OA2 , OAuth 2.0 for ABAP , OPU-XBE , Enterprise Event Enablement , Problem