3513610 - Secured DBCO connection to HANA Cloud keep asking for certificate validate even if sslValidateCertificate=false is enabled

You want to establish a secured DBCO connection from your ABAP server to HANA Cloud, below connection has been set:

HOST=<SQL endpoint URL>:443;CON_PARAM=ENCRYPT=TRUE;sslValidateCertificate=false;

However, connection test failed and keep asking for certificate validation:

-- ERROR Connection failed (RTE:[300015] SSL certificate validation failed: SSL error [536872221]: Unknown error, General error: 0x2000051d | SAPCRYPTOLIB | SSL_connect
SSL API error
Failed to verify peer certificate. Peer not trusted.
0xa0600203 | SSL_ |
-- ERROR nect
Peer not trusted
0xa0600203 | SSL_ | ssl3_get_server_certificate
Peer not trusted
0xa0600203 | SSL_ | ssl3_decode_server_certificate
Peer not trusted
0xa0600203 | SSL_ | ssl_verify_peer_certificates
Peer not trusted
0xa0600203 | SSL_ | ssl_c
-- ERROR er_verify_certificates
Peer not trusted
Certificate verification failed
0xa0600203 | SSL_ | ssl_cert_checker_verify_certificates
Peer not trusted
Certificate:
Certificate:
  Subject:                              CN=hanacloud.vlab-sapcloudplatfor
-- ERROR O=SAP SE, L=Walldorf, SP=Baden-Württemberg, C=DE
  Issuer:                               CN=DigiCert SHA2 Secure Server CA, O=DigiCert Inc, C=US
  Serial Number:                        0C:29:28:32:AB:F8:DB:2E:C8:77:E1:95:B0:AD:B2:6E

• SAP HANA Cloud 1.0 and higher

SSL certificate validation failed, SSL error, Unknown error, SAPCRYPTOLIB, SSL_connect, SSL API error, Failed to verify peer certificate. Peer not trusted, sapcli.pse, sapgenpse, maintain_pk, STRUST , KBA , HAN-CLS-HC , HANA Cloud Services HANA Cloud , HAN-DB-SEC , SAP HANA Security & User Management , Problem