When im brwosing on my virtualbox guest system (Win 10), im getting a NET::ERR_CERT_AUTHORITY_INVALID error. On my host system (Ubuntu) everything works fine.

As network setting i configured NAT.

I use Ubuntu 20.04.2 LTS and our company VPN (openVPN). The Virtualbox version is 6.1.16_Ubuntu r140961

  • What Ubuntu version? What VPN?
    – jitter
    May 3, 2021 at 13:46
  • It's Ubuntu 20.04.2 LTS and our company VPN (openVPN). The Virtualbox version s 6.1.16_Ubuntu r140961
    – michari
    May 4, 2021 at 6:41
  • How did you solved this problem ? I am using same Ubuntu version in VMware workstation 16
    – NoobCoder
    Jun 29, 2022 at 3:49

1 Answer 1


I was able to fix it by adding a bridged network and disabling the NAT adapter from the network settings of vbox. I dont know what exactly is the trouble that these HTTPS sites see when the VM is reaching the network through a NATTed tunnel via the host OS

  • For bridged network do I need to connect to VPN from VM as well ? Or host is fine ? If I am bridged network I am getting Failed to load resource: net::ERR_TUNNEL_CONNECTION_FAILED
    – NoobCoder
    Jun 28, 2022 at 7:57

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