The iTSec Change Salts feature will update the values for 4 + 4 authentication unique keys and salts in the wp-config.php file:
define( 'AUTH_KEY', 'put your unique 64 chars phrase here' );
define( 'SECURE_AUTH_KEY', 'put your unique 64 chars phrase here' );
define( 'LOGGED_IN_KEY', 'put your unique 64 chars phrase here' );
define( 'NONCE_KEY', 'put your unique 64 chars phrase here' );
define( 'AUTH_SALT', 'put your unique 64 chars phrase here' );
define( 'SECURE_AUTH_SALT', 'put your unique 64 chars phrase here' );
define( 'LOGGED_IN_SALT', 'put your unique 64 chars phrase here' );
define( 'NONCE_SALT', 'put your unique 64 chars phrase here' );
So make sure the wp-config.php file is ok.
+++++ To prevent any confusion, I’m not iThemes. +++++
Moderator
Yui
(@fierevere)
永子
https://api.wordpress.org/secret-key/1.1/salt/
You can generate salts here,
make sure there is only one definition for each constant in wp-config.php
no duplicates.
As for navigation 404 errors – try to revise/delete .htaccess file in your site top folder.
You can generate new one by going to Dashboard: Settings > Permalinks
then push Save (no need to change any settings), this will regenerate .htaccess with default rules.