我正在编写一个作业，该作业将通过我的SOCKS5代理连接到客户端的FTP/s服务器，并且我正在使用Apache Commons Net包。问题是我的SOCKS代理被配置为不需要身份验证，但我仍然得到以下异常：
java.net.SocketException: SOCKS : authentication failed
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:443)
at java.net.Socket.connect(Socket.java:519)
我已经尝试将java.net.socks.username和password属性设置为空字符串，但我仍然得到了它。有没有办法告诉代码不要使用身份验证？深入研究底层源代码，我几乎认为它是在查询代理服务器以了解身份验证需求，但我不确定。
好吧，所以问题是我的SOCKS代理被设置为请求身份验证，但也接受未进行身份验证的连接。我们使用Dante，虽然像Filezilla这样的程序足够聪明，可以迭代所有可接受的身份验证方法，但java.net包似乎只偏离了提供的第一种方法。由于我在sockd.conf文件中的身份验证配置如下：
method: username none
user.notprivileged: nobody
java.net要求提供用户名和密码。我只是简单地将方法翻转为“none-username”，Filezilla和java.net都能正确地通过代理。这有点像一个It解决方案，但无论什么都能让代码发挥作用，对吧？
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