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https://issues.apache.org/jira/browse/FTPSERVER-390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933172#action_12933172
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Matthew Schulze commented on FTPSERVER-390:
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I believe it was observed in XP, Vista, and Windows 7, so it's unlikely to be
version-specific.
> FTPServer disabling anonymous not compatible with Windows Explorer
> ------------------------------------------------------------------
>
> Key: FTPSERVER-390
> URL: https://issues.apache.org/jira/browse/FTPSERVER-390
> Project: FtpServer
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.5
> Reporter: Matthew Schulze
> Assignee: Niklas Gustavsson
> Fix For: 1.0.6
>
>
> When using Windows Explorer to attempt to connect to an FTP connection, it
> first attempts an anonymous login and then prompts the user for credentials
> after failure. Disabling anonymous login on the current version of Apache FTP
> Server returns a 530 response and immediately closes the connection,
> preventing the credentials dialog from appearing in Explorer and causing an
> error dialog to be displayed.
> If the USER command is successful and the anonymous user is rejected after
> the PASS command is sent with a 421 response sent by the server, Windows
> Explorer is able to handle the login process properly. To maintain maximum
> compatibility, anonymous user checks should all be handled in the PASS
> command.
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