How to connect to ftp server via ftps?

Question

Java

I am writing a program to connect to an ftp server via ftps using the apache commons-net library.
Code snippet:

String protocol = "TLS";
String host = "192.168.5.165";
String username = "usr";
String password = "111";
String trustStorePath = "C:/TEMP/truststore";
String trustStorePassword = "111111";
int port = 990;

FTPSClient client = new FTPSClient(protocol);

KeyStore trustStore = loadStore("JKS", new File(trustStorePath), trustStorePassword);
X509TrustManager trustManager = TrustManagerUtils.getDefaultTrustManager(trustStore);
        
SSLContext ctx = SSLContext.getInstance("TLSv1.1");
ctx.init(null, new TrustManager[] {trustManager}, null);

FTPSSocketFactory socketFactory = new FTPSSocketFactory(ctx);
client.setSocketFactory(socketFactory);
       
client.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
client.connect(host, port);

I imported the ftp server certificate (WingFtpServer) into my trustStore.
Gives the following error:

220 Wing FTP Server ready... (UNREGISTERED WING FTP SERVER)
AUTH TLS
234 AUTH command OK. Initializing TLS connection.

javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?

  at sun.security.ssl.InputRecord.handleUnknownRecord(InputRecord.java:710)
  at sun.security.ssl.InputRecord.read(InputRecord.java:527)
  at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:973)
  at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
  at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
  at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
  at org.apache.commons.net.ftp.FTPSClient.sslNegotiation(FTPSClient.java:269)
  at org.apache.commons.net.ftp.FTPSClient._connectAction_(FTPSClient.java:211)
  at org.apache.commons.net.SocketClient.connect(SocketClient.java:183)
  at org.apache.commons.net.SocketClient.connect(SocketClient.java:203)
  at edtesb.remsenergy.FTPSTest.test(FTPSTest.java:63)

What am I doing wrong?
I would be grateful if you explain how ftps works in general.

Answer 1

Answered on stackoverflow