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  private final int TELNET__DEFAULT_PORT=23;
  private final int CONNECT_TIMEOUT=3000; //ms
 
...
...
...
 
    boolean isOK=false;
    TelnetClient tc=new TelnetClient();
 
    try
    {
      tc=new TelnetClient();
      tc.setDefaultTimeout(this.CONNECT_TIMEOUT);
      tc.connect(this.IP, this.port);
      isOK=true;
    }
    catch(Exception e)
    {
      logger.error("Error occurred when telnet to ["+this.IP+":"+this.port+"], -> "+e.toString());
      isOK=false;
    }