Plesk Onyx for Linux
kb: technical
ABT: Group A
Applicable to:
- Plesk Onyx for Linux
- Plesk 12.5 for Linux
- Plesk 12.0 for Linux
- Plesk 11.x for Linux
Symptoms
Unable to connect to FTP server on Plesk:
# ftp domain.tld 21
550 SSL/TLS required on the control channel
Login failed.
Remote system type is UNIX.
Using binary mode to transfer files.
Cause
Allow only secure FTPS connections
option is enabled.
Resolution
- Log into Plesk
- Set
Allow both secure FTPS and non-secure FTP connections
in
Plesk > Tools & Settings > Security Policy
Comments
2 comments
After enabling both secure and non-secure FTP passive mode fails to work.
Update: After lot of testing the issue was found to be due to the "MasqueradeAddress" parameter. This does not allow both ftps and passive mode ftp on a server using NAT. Also, changing the mode to only non-secure ftp in the panel does not remove this configuration and hence passive mode still fails.
FYI, all plesk updates are installed and plesk onyx runs on Ubuntu 16.04 with systemd.
Update2: Found that removing the MasqueradeAddress entries from proftpd configuration fixes the issue and allows both passive & active ftp to work simultaneously. Not sure why Plesk adds this to cause issues.
Edwin C Since the error you are receiving is quite general I recommend opening a support ticket with us for further troubleshooting: https://support.plesk.com/hc/en-us/articles/213608509-How-to-submit-a-request-to-Plesk-support-
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