Below is the error I got with kernel 2.6.13.4 with patch-o-matic-ng10051016 :- CC [M] net/ipv4/netfilter/ip_conntrack_sip.o CC [M] net/ipv4/netfilter/ip_nat_sip.o net/ipv4/netfilter/ip_nat_sip.c: In function `ip_nat_sip': net/ipv4/netfilter/ip_nat_sip.c:97: warning: ISO C90 forbids mixed declarations and code CC [M] net/ipv4/netfilter/ip_conntrack_h323_core.o CC [M] net/ipv4/netfilter/ip_conntrack_h323_h225.o net/ipv4/netfilter/ip_conntrack_h323_h225.c: In function `h225_parse_connect_uuie': net/ipv4/netfilter/ip_conntrack_h323_h225.c:111: error: too few arguments to function `ip_conntrack_expect_alloc' net/ipv4/netfilter/ip_conntrack_h323_h225.c:135: warning: implicit declaration of function `ip_conntrack_expect_free' make[3]: *** [net/ipv4/netfilter/ip_conntrack_h323_h225.o] Error 1 make[2]: *** [net/ipv4/netfilter] Error 2 make[1]: *** [net/ipv4] Error 2 make: *** [net] Error 2 And I can't apply pptp_conntrack_nat :- Do you want to apply this patch [N/y/t/f/a/r/b/w/q/?] y cannot apply (1 rejects out of 7 hunks) Regards.