404 Errors after clicking Wordpress links

404 Errors - Page Not found issue. After clicking Wordpress links

Here is the steps to escape from this issue.

1. Login to the WordPress Dashboard
2. Click of Settings on the menu on the left hand side.
3. Click on Permanlinks under Settings.
4. Remember which setting it is set on now.  (If you are using a custom structure, copy or save the custom structure somewhere.)
5. Select Default
6. Click on Save Changes    --- Stay here and check your site. It will work fine :-)
7. Change it back to the setting it was on before you selected Default. (Put the custom structure back if you had one.)
8. Click Save Changes

If the above steps didn't fix your issue. Then, change the .htaccess file.

 # BEGIN WordPress

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]


# END WordPress 

Option2: 

rename the .htaccess file. change the permalink settings. This will generate the new .htaccess file and you are able to login perfectly.

Cheers,

Venkatesan Prabu. J

Head, Kaashiv Infotech

Chennai.