java.net.ConnectException: Connection timed out: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at org.apache.commons.net.SocketClient.connect(SocketClient.java:188)
    at org.apache.commons.net.SocketClient.connect(SocketClient.java:209)
    at Main.main(Main.java:135)

String server2 = "ftp.aiub.unibe.ch";
int port = 21;
String user = "anonymous";
String pass = "test";

FTPClient ftpClient2 = new FTPClient();

try {

    ftpClient2.connect(server2, port);
    ftpClient2.login(user, pass);
    ftpClient2.enterLocalPassiveMode();
    ftpClient2.setFileType(FTP.BINARY_FILE_TYPE);

    // CLK

    String remoteFile2 = "/CODE/" + y + "/COD" + gpsWeek + weekDayNumber + ".CLK.Z";
    File downloadFile2 = new File("D:/BERNESE/OUT/COD" + gpsWeek + weekDayNumber + ".CLK.Z");
    OutputStream outputStream2 = new BufferedOutputStream(new FileOutputStream(downloadFile2));
    boolean success2 = ftpClient2.retrieveFile(remoteFile2, outputStream2);
    outputStream2.close();

    if (success2) {
        System.out.println("File COD" + gpsWeek + weekDayNumber + ".CLK.Z has been downloaded successfully.");
    }

    // ION

    String remoteFile3 = "/CODE/" + y + "/COD" + gpsWeek + weekDayNumber + ".ION.Z";
    File downloadFile3 = new File("D:/BERNESE/ATM/COD" + gpsWeek + weekDayNumber + ".ION.Z");
    OutputStream outputStream3 = new BufferedOutputStream(new FileOutputStream(downloadFile3));
    boolean success3 = ftpClient2.retrieveFile(remoteFile3, outputStream3);
    outputStream3.close();

    if (success3) {
        System.out.println("File COD" + gpsWeek + weekDayNumber + ".ION.Z has been downloaded successfully.");
    }

    // EPH (PRE)

    String remoteFile4 = "/CODE/" + y + "/COD" + gpsWeek + weekDayNumber + ".EPH.Z";
    File downloadFile4 = new File("D:/BERNESE/ORB/COD" + gpsWeek + weekDayNumber + ".PRE.Z");
    OutputStream outputStream4 = new BufferedOutputStream(new FileOutputStream(downloadFile4));
    boolean success4 = ftpClient2.retrieveFile(remoteFile4, outputStream4);
    outputStream4.close();

    if (success4) {
        System.out.println("File COD" + gpsWeek + weekDayNumber + ".PRE.Z has been downloaded successfully.");
    }

    // ERP (IEP)

    String remoteFile5 = "/CODE/" + y + "/COD" + gpsWeek + weekDayNumber + ".ERP.Z";
    File downloadFile5 = new File("D:/BERNESE/ORB/COD" + gpsWeek + weekDayNumber + ".IEP.Z");
    OutputStream outputStream5 = new BufferedOutputStream(new FileOutputStream(downloadFile5));
    boolean success5 = ftpClient2.retrieveFile(remoteFile5, outputStream5);
    outputStream5.close();

    if (success5) {
        System.out.println("File COD" + gpsWeek + weekDayNumber + ".IEP.Z has been downloaded successfully.");
    }

    // DCB

    String remoteFile6 = "/CODE/" + y + "/P1C1" + shortYear + month + ".DCB.Z";
    File downloadFile6 = new File("D:/BERNESE/ORB/P1C1" + shortYear + month + ".DCB.Z");
    OutputStream outputStream6 = new BufferedOutputStream(new FileOutputStream(downloadFile6));
    boolean success6 = ftpClient2.retrieveFile(remoteFile6, outputStream6);
    outputStream6.close();

    if (success6) {
        System.out.println("File P1C1" + shortYear + month + ".DCB.Z has been downloaded successfully.");
    }

} catch (IOException ex) {
    System.out.println("Error: " + ex.getMessage());
    ex.printStackTrace();
} finally {
    try {
        if (ftpClient2.isConnected()) {
            ftpClient2.logout();
            ftpClient2.disconnect();
        }
    } catch (IOException ex) {
        ex.printStackTrace();
    }
}