Importing OVA into VCSA 6.5 fails – The operation failed for an unknown reason

I’ve experienced a problem while importing an OVA into VCSA 6.5. The error that I’ve got is the one bellow. As you can see it says that the problem occurs due to certificates that the browser does not trust. If you are checking the certificate in the web browser, you will see a certificate warning. The solution found is actually quite simple. You have to download the VMCA root certificates