Issue Backup - FTP(S) Storage Settings - Cannot Set Up FTP-Connection

[kornblume]

Hello,
I try to install a FTP-Storage (local network, QNAP, FTP activated), but Plesk cannot connect.
Works fine from other machines in the same network.
Plesk returns:
Error: Unable to access the storage: Transport error: unable to list directory: Curl error: (7) Couldn't connect to server: Last FTP request: Last FTP response:
Make sure you have entered the correct storage settings. You can check them independently with the command:
curl -v --ftp-pasv -u isp 'ftp://XXXXX//ISP/Plesk//'
In CLI: curl -v --ftp-pasv -u isp 'ftp://XXXXX//ISP/Plesk//'
Trying XXXXX
.* connect to XXXXX port 21 failed: Connection timed out
* Failed to connect to XXXXX port 21: Connection timed out
* Closing connection 0
curl: (7) Failed to connect to XXXXX port 21: Connection timed out

Can please someone advice me?
Regards,
Gunther

 

[Bitpalast]

Other users have reported that a firewall before their server was blocking port 21.

 

[kornblume]

Hi,
Actually there is no FW between my Plesk-Server and the FTP-Server.
From CLI, I cannot connect to any ftp-server on that machine.
I can ping the FTp-Server.
FTP works fine fromany other machine in the net.
Could it be, that there is a firewall-rule active on the plesk server, that I do not see on the Firewall-Interface in plesk?

Regards,
Gunther

 

[Bitpalast]

You could try to look at some commands to find out what a port is doing. The relevant ports are 21 and 22, e.g.

# sudo lsof -i:22
# sudo netstat -tulpn | grep LISTEN
# sudo ss -tulwn
# sudo tcpdump -i <nic id> 'port 22' (for example: tcpdump -i eth01 'port 22')

 

[eruizmillan]

Hi,
It happens to me the same as @kornblume , I can connect to another IP but not connect to the server IP.

Thanks,
Enrique

 

[Bitpalast]

What have you tried to analyze the problem? For example what are the outputs of the commands shown above and the curl test that Plesk suggests?