VirtualBox - no SSH access

Trying VirtualBox on Windows 2019 server. Install and run HA just fine, using a Bridged Network connection.

Installed SSH Add-on, but HA refuses connection. I see the following in the HA console:

“nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not fund. Use the iptables CT target to attach helpers instead.”

Ping works as well. Not sure how to proceed…?