cURL error 60: Peer’s Certificate issuer is not recognized.

Hello, i connect to a http serverand all wordk ok, but now this server is SSL and no longer work the conection. Getting this error:
https://arquitecturayconcreto.com/wordpress

WP_Error Object
(
[errors] => Array
(
[http_request_failed] => Array
(
[0] => cURL error 60: Peer’s Certificate issuer is not recognized.
)

)

[error_data] => Array
(
)

)