Login and registeration stopped working suddenly - Magento 1.9

Question

In my store login and register just keep on refreshing i have add the following lines in every register.phtml after form tag

<?php echo $this->getBlockHtml('formkey'); ?> 

<input type="hidden" name="form_key" value="<?php echo Mage::getSingleton('core/session')->getFormKey() ?>" />**strong text**

but still not working !

configuration/general/web/cookie settings:

Hhtp only :no, Cookie restriction :no, Time :86400.

added these lines in login.phtml but still just refreshing

      <input type="hidden" name="form_key" value="<?php echo Mage::getSingleton('core/session')->getFormKey(); ?>" />

added theses lines in accountController.php in login post action but still issue exists the same

* Login post action
 */
public function loginPostAction(){

// generate form_key if missing or invalid
if (!($formKey = $this->getRequest()->getParam('form_key', null))
        || $formKey != Mage::getSingleton('core/session')->getFormKey()) {
    $this->getRequest()->setParams(array(
        'form_key' =>Mage::getSingleton('core/session')->getFormKey()
    ));
}
    if ($this->_getSession()->isLoggedIn()) {
        $this->_redirect('*/*/');
        return;
    }

Answer 1

You have to just add this code <?php echo $this->getBlockHtml('formkey'); ?> right after a <form> tag OR the second one but not both.

EDIT:

For your loop problem:

1) the <input type="hidden" name="form_key" value="<?php echo Mage::getSingleton('core/session')->getFormKey(); ?>" /> you add it right after <ul class="form-list">

2) Update this query in your database: update core_config_data set value = null where path = 'web/cookie/cookie_domain'

3) change in database: table: core_config_data, update web/url/redirect_to_base to 0 instead of 1

4) clean your Magento and navigator cache and session