In `retry_listener_ports`, we check if port matches exactly and *one* of the addresses is a wildcard address: ``` 2795 const int may_need_rebind = 2796 port_matches_exact && bool_neq(tor_addr_is_null(&wanted->addr), 2797 tor_addr_is_null(&conn->addr)); ``` We should also check if address family is the same between old and new listener. If they differ, we don't need to do rebinding. See discussion on legacy/trac#17873.