Plesk Firewall and iptables

[MuzafferE]

Hi,

os : Centos 6.5
Plesk: 11.5

I want to open port 1988. When i add rules on plesk firewall everythinks ok but after few min later port is again close. I dont understand why close again ?

Thank you

 

[InderS]

Are you using any third party firewall on your server ?