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Is kernel module nf_conntrack exist at /lib/modules//kernel/net/netfilter/ and loaded? If exist try: modprobe nf_conntrack


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We can use many tools (netstat, ip, /proc, etc.). The ss utility may give you a very useful info: ss -i -4 -t -o state established In this example, we obtain internal data of connections established tcp/ipv4.


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If you using linux , you can set number of maximum connection via : sysctl net.ipv4.netfilter.ip_conntrack_max=YOURNUMBER Of course , may be you need to load ip_conntrack module



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