Symptoms
-
Cannot connect to FTP server using FileZilla:
Response: 227 Entering Passive Mode (203,0,113,2,205,97).
Command: LIST
Response: 534 Protection level negotiation failed.
Error: Failed to retrieve directory listing -
Connections using other FTP client software and from Plesk server itself are possible.
Cause
FTP client expects the certificate for secure connection, but FTP server does not offer it.
Resolution
Allow secure and non-secure FTP connections in Plesk:
For all websites
- Log into Plesk
- Go to Tools & Settings > Security policy > Secure FTP and select Allow both secure FTPS and non-secure FTP connections:
For all websites on particular Plesk IP address (Only Windows)
- Log into Plesk
- Determine IP address of the websites by going to Domains > example.com
- Go to Tools & Settings > Security policy > Secure FTP and select Use custom FTPS policy per IP address:
- Go to Tools & Settings > IP addresses > 203.0.113.2 and select Allow both secure FTPS and non-secure FTP connections: