Huh Very strange in kernel 6.0.0 i not found : net.netfilter.nf_conntrack_helper in old kernel 5.19.14 in sysctl -a | grep net.netfilter.nf_conntrack_helper net.netfilter.nf_conntrack_helper = 1 m. > On 6 Oct 2022, at 14:18, Florian Westphal <fw@xxxxxxxxx> wrote: > > Martin Zaharinov <micron10@xxxxxxxxx> wrote: >> Hi Team >> >> I make test image with kernel 6.0.0 and schem is : >> >> internet <> router NAT <> windows client pptp >> >> with l2tp all is fine and connections is establesh. >> >> But when try to make pptp connection stay on finish phase and not connect . >> >> try to remove module : nf_conntrack_pptp and same not work. > > Did you rely on > sysctl net.netfilter.nf_conntrack_helper=1, or are you assigning the > helper via ruleset?