Article ID: 119237, created on Dec 20, 2013, last review on Apr 19, 2016

  • Applies to:
  • Plesk 12.0 for Linux
  • Plesk 11.0 for Linux
  • Plesk 11.5 for Linux
  • Plesk 12.5 for Windows
  • Plesk 12.0 for Windows
  • Plesk 11.0 for Windows
  • Plesk 11.5 for Windows


Cannot get access to the FTP with the authentication error:

Status: Resolving address of
Status: Connecting to
Status: Connection established, waiting for welcome message...
Response:       220 Microsoft FTP Service
Command:        USER user
Response:       331 Password required
Command:        PASS ********
Response:       530 User cannot log in.
Error:  Critical error
Error:  Could not connect to server

FTP log contains records like:

2013-12-04 16:05:11 - FTPSVC6 SERVER_HOSTNAME - 21 USER user 331 0 0 23 20 0
2013-12-04 16:05:11 - FTPSVC6 SERVER_HOSTNAME - 21 PASS *** 530 1326 41 25 15 0
2013-12-04 16:05:11 - FTPSVC6 SERVER_HOSTNAME - 21 ControlChannelClosed - - 0 0 75 35 8281

Also Plesk Server is configured as part of the Active Directory forest.


Since Plesk Server is connected to the Active Directory domain, we need to use full 'username' with the 'servername' prefix.


Use 'servername\login' format as FTP username:

Connected to
220 Microsoft FTP Service
User ( server_hostname\user
331 Password required
230 User logged in.
ftp> exit

Please note that Active Directory is not required for Plesk. We do not recommend to install Plesk on the Active Directory Controller server.

Search Words

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500 PORT/EPRT (Active Mode/Extended Active Mode) is not supported. Use PASV/EPSV instead of this

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530 User cannot log in.

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Unable to login to a user via FTP: "Cannot log in, login failed, Remote system type is Windows_NT"

530 User cannot log in

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Critical error Error: Could not connect to server

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