Error on update security rules

Hello,

I got errors for some days when NinjaFirewall tries to update its security rules. The log shows:

stream_socket_client(): unable to connect to ssl://updates.nintechnet.com:443 (Unknown error))
stream_socket_client(): Failed to enable crypto
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
[22/Mrz/24:08:06:33 +0100] Error: Unable to connect to the remote server (stream_socket_client(): SSL operation failed with code 1.

Regards,

Marc