MineOS added ports vanish

Hi,

I added ports to the iptable system and they get removed after some time.
Is there a standard script on the server preinstalled or some standard software that could reset those ports at some point?

please help

I added the 25566 port by using this command:
iptables -I INPUT -p tcp --dport 25566–syn -j ACCEPT

greetings
fred

worked fine
thx mate