Question Firewall rules not working correctly

[Dave Claessens]

Hello,

I have some problems with setting up my firewall.
Everything works, except FTP.
So I added a firewall rule (port 21) to allow FTP, but after this it still doesn't work.
It only works when I add the rule for all ports, looks like an other port is used, but I've set 21 as the FTP port in the FTP software.

It also works when I manually add the port with this command:
sudo firewall-cmd --zone=public --add-port=21/tcp --permanent
sudo firewall-cmd --zone=public --add-port=21/udp --permanent
sudo firewall-cmd --reload
But after applying the firewall rules again, the changes are reversed and it doesn't work anymore.

Does anyone have a sollution for me?
Thank you!

Plesk: Onyx v17.5.3
OS: CentOS 7.2.1511
FTP software: PhpStorm
FTP connection: FTPS on port 21

 

[AYamshanov]

Hi,

FTP it is not only 21/tcp port. Also, FTP does not use 21/udp.

Did you see https://talk.plesk.com/threads/plesk-firewall-and-ftps.343545 or How to configure a passive ports range for ProFTPd on a server behind a firewall? Have you got logs from FTP-client? Is server behind NAT? Is your server work in Cloud environment?