diff -urN linux-2.4.33-wintrk4/include/linux/netfilter_ipv4/ip_conntrack_tcp.h linux-2.4.33-wintrk5/include/linux/netfilter_ipv4/ip_conntrack_tcp.h
--- linux-2.4.33-wintrk4/include/linux/netfilter_ipv4/ip_conntrack_tcp.h	Sun Oct 22 13:16:12 2006
+++ linux-2.4.33-wintrk5/include/linux/netfilter_ipv4/ip_conntrack_tcp.h	Sun Oct 22 13:14:23 2006
@@ -44,7 +44,9 @@
 	u_int8_t	retrans;	/* Number of retransmitted packets */
 	u_int8_t	last_index;	/* Index of the last packet */
 	u_int32_t	last_seq;	/* Last sequence number seen in dir */
+	u_int32_t	last_ack;	/* Last sequence number seen in opposite dir */
 	u_int32_t	last_end;	/* Last seq + len */
+	u_int32_t	last_win;	/* Last window advertisement seen in dir */
 };
 
 #endif /* _IP_CONNTRACK_TCP_H */
diff -urN linux-2.4.33-wintrk4/net/ipv4/netfilter/ip_conntrack_proto_tcp.c linux-2.4.33-wintrk5/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
--- linux-2.4.33-wintrk4/net/ipv4/netfilter/ip_conntrack_proto_tcp.c	Sun Oct 22 13:16:12 2006
+++ linux-2.4.33-wintrk5/net/ipv4/netfilter/ip_conntrack_proto_tcp.c	Sun Oct 22 13:13:07 2006
@@ -666,12 +666,16 @@
 		if (index == TCP_ACK_SET) {
 			if (state->last_dir == dir
 			    && state->last_seq == seq
-			    && state->last_end == end)
+			    && state->last_ack == ack
+			    && state->last_end == end
+			    && state->last_win == win)
 				state->retrans++;
 			else {
 				state->last_dir = dir;
 				state->last_seq = seq;
+				state->last_ack = ack;
 				state->last_end = end;
+				state->last_win = win;
 				state->retrans = 0;
 			}
 		}