curl: (56) Peer does not recognize and trust the CA that issued your certificate.

Issue

• curl: (56) Peer does not recognize and trust the CA that issued your certificate.

[root@test ~]# curl -vv -k --cert /<path>/cert.pem --key /<path>/key.key https://<web_address>
* About to connect() to <website address> port 443 (#0)
*   Trying <ip_address>...
* Connected to <web_address> (<ip_address>) port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
* skipping SSL peer certificate verification
* SSL connection using TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
* Server certificate:
*   subject: CN=<web_address>,OU=ITA22,O=<Issuer Name>,L=Turin,C=IT
*   start date: Jan 11 00:00:00 2018 GMT
*   expire date: Feb 10 12:00:00 2019 GMT
*   common name: <web_address>
*   issuer: CN=GeoTrust RSA CA 2018,OU=www.digicert.com,O=DigiCert Inc,C=US
> GET /LFI/?wsdl HTTP/1.1
> User-Agent: curl/7.29.0
> Host: <web_address>
> Accept: */*
> 
* skipping SSL peer certificate verification
* NSS: client certificate from file
*   subject: CN=<web_address>,OU=ITA22,O=<Issuer Name>,L=Turin,C=IT
*   start date: Jan 11 00:00:00 2018 GMT
*   expire date: Feb 10 12:00:00 2019 GMT
*   common name: <web_address>
*   issuer: CN=GeoTrust RSA CA 2018,OU=www.digicert.com,O=DigiCert Inc,C=US
* SSL read: errno -12195 (SSL_ERROR_UNKNOWN_CA_ALERT)
* Peer does not recognize and trust the CA that issued your certificate.
* Closing connection 0
curl: (56) Peer does not recognize and trust the CA that issued your certificate.
[root@test ~]#