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Dominique Martinet reported a TCP hang problem when simultaneous open was used. The problem is that the tcp_conntracks state table is not smart enough to handle the case. The state table could be fixed by introducing a new state, but that would require more lines of code compared to this patch, due to the required backward compatibility with ctnetlink. Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Reported-by: Dominique Martinet <asmadeus@codewreck.org> Tested-by: Dominique Martinet <asmadeus@codewreck.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>