Program: 21299
Project: 21299
Buggy source:
public static boolean doReconnect(){
  if (Reconnecter.waitForRunningRequests() > 0 && LAST_RECONNECT_SUCCESS) {
    return true;
  }
  boolean ipChangeSuccess=false;
  IS_RECONNECTING=true;
  if (Reconnecter.isGlobalDisabled()) {
    if (System.currentTimeMillis() - lastIPUpdate > 1000 * JDUtilities.getSubConfig("String_Node_Str").getIntegerProperty("String_Node_Str",60 * 10)) {
      ipChangeSuccess=Reconnecter.checkExternalIPChange();
      JDUtilities.getGUI().displayMiniWarning(JDLocale.L("String_Node_Str","String_Node_Str"),JDLocale.L("String_Node_Str","String_Node_Str"),60000);
    }
    if (!ipChangeSuccess) {
      IS_RECONNECTING=false;
      return false;
    }
  }
  ArrayList<DownloadLink> disabled=new ArrayList<DownloadLink>();
  if (!ipChangeSuccess) {
    if (JDUtilities.getController().getForbiddenReconnectDownloadNum() > 0) {
      IS_RECONNECTING=false;
      return false;
    }
    Interaction.handleInteraction(Interaction.INTERACTION_BEFORE_RECONNECT,JDUtilities.getController());
    String type=JDUtilities.getConfiguration().getStringProperty(Configuration.PARAM_RECONNECT_TYPE,null);
    if (type == null) {
      IS_RECONNECTING=false;
      logger.severe("String_Node_Str");
      return false;
    }
    IS_RECONNECTING=true;
    logger.info("String_Node_Str");
    boolean interrupt=JDUtilities.getSubConfig("String_Node_Str").getBooleanProperty("String_Node_Str",true);
    if (interrupt) {
      JDUtilities.getController().pauseDownloads(true);
      Iterator<FilePackage> iterator=JDUtilities.getController().getPackages().iterator();
      FilePackage fp=null;
      DownloadLink nextDownloadLink;
      while (iterator.hasNext()) {
        fp=iterator.next();
        Iterator<DownloadLink> it2=fp.getDownloadLinks().iterator();
        while (it2.hasNext()) {
          nextDownloadLink=it2.next();
          if (nextDownloadLink.getLinkStatus().hasStatus(LinkStatus.PLUGIN_IN_PROGRESS)) {
            nextDownloadLink.setEnabled(false);
            logger.info("String_Node_Str" + nextDownloadLink);
            disabled.add(nextDownloadLink);
          }
        }
      }
    }
    if (type.equals(JDLocale.L("String_Node_Str","String_Node_Str"))) {
      ipChangeSuccess=new ExternReconnect().interact(null);
    }
 else     if (type.equals(JDLocale.L("String_Node_Str","String_Node_Str"))) {
      ipChangeSuccess=new BatchReconnect().interact(null);
    }
 else {
      ipChangeSuccess=new HTTPLiveHeader().interact(null);
    }
    if (interrupt) {
      JDUtilities.getController().pauseDownloads(false);
      for (      DownloadLink link : disabled) {
        logger.info("String_Node_Str" + link);
        link.setEnabled(true);
      }
    }
    LAST_RECONNECT_SUCCESS=ipChangeSuccess;
    logger.info("String_Node_Str" + ipChangeSuccess);
  }
  if (ipChangeSuccess) {
    Reconnecter.resetAllLinks();
  }
  if (ipChangeSuccess) {
    Interaction.handleInteraction(Interaction.INTERACTION_AFTER_RECONNECT,JDUtilities.getController());
  }
  IS_RECONNECTING=false;
  lastIPUpdate=System.currentTimeMillis();
  CURRENT_IP=JDUtilities.getIPAddress();
  RECONNECT_REQUESTS=0;
  return ipChangeSuccess;
}

Fixed version (ground truth):
public static boolean doReconnect(){
  if (Reconnecter.waitForRunningRequests() > 0 && LAST_RECONNECT_SUCCESS) {
    return true;
  }
  boolean ipChangeSuccess=false;
  IS_RECONNECTING=true;
  if (Reconnecter.isGlobalDisabled()) {
    if (System.currentTimeMillis() - lastIPUpdate > 1000 * JDUtilities.getSubConfig("String_Node_Str").getIntegerProperty("String_Node_Str",60 * 10)) {
      ipChangeSuccess=Reconnecter.checkExternalIPChange();
      JDUtilities.getGUI().displayMiniWarning(JDLocale.L("String_Node_Str","String_Node_Str"),JDLocale.L("String_Node_Str","String_Node_Str"),60000);
    }
    if (!ipChangeSuccess) {
      IS_RECONNECTING=false;
      return false;
    }
  }
  ArrayList<DownloadLink> disabled=new ArrayList<DownloadLink>();
  if (!ipChangeSuccess) {
    if (JDUtilities.getController().getForbiddenReconnectDownloadNum() > 0) {
      IS_RECONNECTING=false;
      return false;
    }
    Interaction.handleInteraction(Interaction.INTERACTION_BEFORE_RECONNECT,JDUtilities.getController());
    String type=JDUtilities.getConfiguration().getStringProperty(Configuration.PARAM_RECONNECT_TYPE,JDLocale.L("String_Node_Str","String_Node_Str"));
    if (type == null) {
      IS_RECONNECTING=false;
      logger.severe("String_Node_Str");
      return false;
    }
    IS_RECONNECTING=true;
    logger.info("String_Node_Str");
    boolean interrupt=JDUtilities.getSubConfig("String_Node_Str").getBooleanProperty("String_Node_Str",true);
    if (interrupt) {
      JDUtilities.getController().pauseDownloads(true);
      Iterator<FilePackage> iterator=JDUtilities.getController().getPackages().iterator();
      FilePackage fp=null;
      DownloadLink nextDownloadLink;
      while (iterator.hasNext()) {
        fp=iterator.next();
        Iterator<DownloadLink> it2=fp.getDownloadLinks().iterator();
        while (it2.hasNext()) {
          nextDownloadLink=it2.next();
          if (nextDownloadLink.getLinkStatus().hasStatus(LinkStatus.PLUGIN_IN_PROGRESS)) {
            nextDownloadLink.setEnabled(false);
            logger.info("String_Node_Str" + nextDownloadLink);
            disabled.add(nextDownloadLink);
          }
        }
      }
    }
    if (type.equals(JDLocale.L("String_Node_Str","String_Node_Str"))) {
      ipChangeSuccess=new ExternReconnect().interact(null);
    }
 else     if (type.equals(JDLocale.L("String_Node_Str","String_Node_Str"))) {
      ipChangeSuccess=new BatchReconnect().interact(null);
    }
 else {
      ipChangeSuccess=new HTTPLiveHeader().interact(null);
    }
    if (interrupt) {
      JDUtilities.getController().pauseDownloads(false);
      for (      DownloadLink link : disabled) {
        logger.info("String_Node_Str" + link);
        link.setEnabled(true);
      }
    }
    LAST_RECONNECT_SUCCESS=ipChangeSuccess;
    logger.info("String_Node_Str" + ipChangeSuccess);
  }
  if (ipChangeSuccess) {
    Reconnecter.resetAllLinks();
  }
  if (ipChangeSuccess) {
    Interaction.handleInteraction(Interaction.INTERACTION_AFTER_RECONNECT,JDUtilities.getController());
  }
  IS_RECONNECTING=false;
  lastIPUpdate=System.currentTimeMillis();
  CURRENT_IP=JDUtilities.getIPAddress();
  RECONNECT_REQUESTS=0;
  return ipChangeSuccess;
}