Applicable to:
- Plesk for Linux
Symptoms
ProFTPD can not start with the following error:
Fatal: unable to get connection info: Socket operation on non-socket
Cause
ProFTPD is configured to run in
inetd
mode rather than
standalone. In this mode, the ProFTPD server expects to be started by the inetd (or xinetd) servers, which implies that stdin/stdout will be sockets instead of terminals. As a result, socket operations will fail and the above error will be printed.
Resolution
1. Connect to the server using SSH
2. Modify the
/etc/proftpd.conf
configuration file and add or edit the
ServerType
directive as follows:
ServerType standalone
#ServerType inetd
Comments
4 comments
@Sharul Hafiz
Make sure that no other application is running on this port:
If found, kill its process and then restart xinetd service.
Tried this but greeted with another message
Failed binding to ::, port 21: Address already in use
Check the ServerType directive to ensure you are configured correctly
Check to see if inetd/xinetd, or another proftpd instance, is already using ::, port 21
Unable to start proftpd; check logs for more details
Done, on WinSCP still can't connect with this error:
Timeout detected. (data connection)
Could not retrieve directory listing
Error listing directory '/'.
On server:
in dir_check_full(): path = '/', fullpath = '/opt/xxx/xxx/....
@Sharul, it looks like you need to apply the following article: https://support.plesk.com/hc/en-us/articles/115004422234-Cannot-connect-to-FTP-Connection-timed-out-after-20-seconds-of-inactivity-Error-Failed-to-retrieve-directory-listing-
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