The biggest issue for people updating could be the switch from iptables to nftables, which may break many firewall scripts. There is a documentation update pen

The biggest issue for people updating could be the switch from iptables to nftables, which may break many firewall scripts. There is a documentation update pending merging in the official documentation that covers how to do use the Firewall in 4.2. https://github.com/QubesOS/qubes-doc/blob/86a6f12e2a882dfffbc04818458589655843514d/user/security-in-qubes/firewall.md https://github.com/QubesOS/qubes-doc/blob/86a6f12e2a882dfffb...