I’m recieving this problem for PayPal Pro too.
I get the – Error: There was a problem connecting to the payment gateway. after filling out shipping billing and cardinal commerce 3d secure.
I contacted PayPal and they said it was a WooCommerce issue.
I replaced the ca-bundle.crt file in my wp-includes file from https://curl.haxx.se/docs/caextract.html and unfortunately it didn’t work.
Someone please help!