Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxx> wrote: > I can only assume that the client is/are behind like a carrier-grade NAT > and the bogus SYN-ACK sent by the server is replying a connection attempt > from another client. Yes, the best thing to do is to reinit the state. Yes, thats my guess as well, some sort of CGN or stateless nat hding multiple clients. Thanks for the quick review!