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https://issues.apache.org/jira/browse/FTPSERVER-426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13140183#comment-13140183
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Alexey Myasnikov commented on FTPSERVER-426:
--------------------------------------------
Looks like I got a little excited with "most". I had tested Cyberduck and it
sends FEAT before USER. Then I had tested Cyberduck with vsftpd and it works
just fine (vsftpd answers to FEAT from unauthenticated users), so I had
supposed that this behaviour is quite standard. Also I seen similar behavior on
some version of fireftp, but I can't reproduce this on current version.
Maybe it is Cyberduck's issue, but this client works fine with popular
ftp-servers such as ProFTPD and vsftpd. Both of them answers to FEAT from
unauthenticated users.
> Most ftp-clients sends FEAT before authentication
> -------------------------------------------------
>
> Key: FTPSERVER-426
> URL: https://issues.apache.org/jira/browse/FTPSERVER-426
> Project: FtpServer
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.5, 1.0.6, 1.1.0
> Reporter: Alexey Myasnikov
>
> Most clients sends FEAT command before authentication. So, it should be
> listed in NON_AUTHENTICATED_COMMANDS in
> org.apache.ftpserver.impl.DefaultFtpHandler. Please, find the patch below.
> --- a/core/src/main/java/org/apache/ftpserver/impl/DefaultFtpHandler.java
> +++ b/core/src/main/java/org/apache/ftpserver/impl/DefaultFtpHandler.java
> @@ -48,7 +48,7 @@ public class DefaultFtpHandler implements FtpHandler {
> private final Logger LOG =
> LoggerFactory.getLogger(DefaultFtpHandler.class);
>
> private final static String[] NON_AUTHENTICATED_COMMANDS = new String[] {
> - "USER", "PASS", "AUTH", "QUIT", "PROT", "PBSZ" };
> + "USER", "PASS", "AUTH", "QUIT", "PROT", "PBSZ", "FEAT" };
>
> private FtpServerContext context;
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