Cobra Forum

Symptoms
Plesk backup to a remote FTP server fails with one of the following errors:

Error: Transport error: unable to list directory: Curl error: (28) Timeout was reached: Last FTP request: LIST Last FTP response: 200 Type set to A

Transport error: unable to list directory: Curl error: (28) Timeout was reached: Last FTP request: PASV Last FTP response: 229 Entering Extended Passive Mode (|||5985|)

Cause
The FTP ports on the remote FTP server are filtered by a firewall.

Resolution
For remote FTP backups to work, make sure that these ports are open.

• On the FTP server

• Incoming and outgoing connections:
• 20 - FTP data transfer for active mode (TCP)
• 21 - FTP (TCP)
• Incoming connections only:
• 49152-65535 - (TCP) for FTP passive mode

• On the Plesk server

• Incoming and outgoing connections:
• 20 - FTP data transfer for active mode (TCP)
• 21 - FTP (TCP)