Java FTPSClient-SSL对等错误关闭-间歇性错误

如何解决Java FTPSClient-SSL对等错误关闭-间歇性错误

我正在尝试使用Apache FTPSClient库传输文件。这是2个单独的程序，用于连接和发送文件。有时从两个客户端成功进行文件传输，有时1个程序失败，有时都失败。 我已经用相同的错误遍历了线程。我无法确定发生这种情况的确切原因。 对使用相同端口号连接到同一FTP站点的2个客户端有什么限制？如果是，有时它是如何工作的。请提示。调用connect（）时引发错误。

堆栈跟踪：

javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:944)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1323)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1350)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1334)
    at org.apache.commons.net.ftp.FTPSClient.sslNegotiation(FTPSClient.java:269)
    at org.apache.commons.net.ftp.FTPSClient._connectAction_(FTPSClient.java:205)
    at org.apache.commons.net.socketClient.connect(SocketClient.java:176)
    at org.apache.commons.net.socketClient.connect(SocketClient.java:196)
Caused by: java.io.EOFException: SSL peer shut down incorrectly
    at com.sun.net.ssl.internal.ssl.InputRecord.read(InputRecord.java:462)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:925)
    ... 11 more

public void publish(FtpConnection conn,File[] files) throws FTPException
{
    FTPSClient ftp = null;
    String protocol = "TLS"; // TLS / null (SSL)
    int port = 990;
    int timeoutInMillis = 10000;
    boolean isImpicit = true;
    try {
        ftp = new FTPSClient(protocol,isImpicit);
        ftp.setDataTimeout(timeoutInMillis);
        LOG.info("Before calling connect");
        ftp.connect(conn.getHost(),port);
        LOG.info("FTP connect successful");
        ftp.enterLocalPassiveMode();
        ftp.login(conn.getUsername(),conn.getpassword());
        LOG.info("FTP login successful");
        ftp.execPBSZ(0);
        ftp.execPROT("P");
        ftp.setFileType(FTP.BINARY_FILE_TYPE);
        for (File file : files) {
            publish(ftp,conn.getDirectory(),file);
        }
    }
    catch (Exception e)
    {   
        LOG.error("Failed to FTP.",e);
        throw new FTPException("Failed to FTP message.",e);
    }
    finally
    {
        close(ftp);
    }
}