The output ports seems to be non-7075, maybe try using sport 7075 instead?
Thank you for your answer.
I have done:
/sbin/iptables -t filter -A OUTPUT -p udp --dport 7075 -j ACCEPT
/sbin/iptables -t filter -A INPUT -p udp --dport 7075 -j ACCEPT
/sbin/iptables -t filter -A OUTPUT -p tcp --dport 7075 -j ACCEPT
/sbin/iptables -t filter -A INPUT -p tcp --dport 7075 -j ACCEPT
/sbin/iptables -t filter -A OUTPUT -p udp --sport 7075 -j ACCEPT
/sbin/iptables -t filter -A INPUT -p udp --sport 7075 -j ACCEPT
/sbin/iptables -t filter -A OUTPUT -p tcp --sport 7075 -j ACCEPT
/sbin/iptables -t filter -A INPUT -p tcp --sport 7075 -j ACCEPT
But it is the same

That sucks. Last option would be to check your ip6tables for rules and to also tcpdump the packets to see where they're goin.