Problem: The client is experiencing issues with the language switcher in the header and footer of their website not working, while it functions correctly in mobile or tablet formats. The system admin has implemented security measures that block access to anything related to wp-admin unless connected via the company's VPN. WPML uses admin-ajax.php for the language switcher, but not in all cases. Solution: We recommended checking the documentation on enabling a language cookie to support Ajax filtering: Activation d'un cookie de langue pour supporter le filtrage Ajax. The client should try toggling the Ajax filtering support and also uncheck the "Auto sign-in/sign-out feature" under WPML->Languages -> Language URL Format. Additionally, testing in a minimal environment by deactivating all plugins except WPML and switching to a default WordPress theme like Twenty Twenty-one could help identify any conflicting plugins. We also provided information on making exceptions for specific endpoints in the VPN/Firewall/Apache .htaccess settings to allow admin-ajax.php and admin-post.php, which are used internally by WordPress and several plugins, including WPML. Furthermore, we suggested using the
wpml_ls_enable_ajax_navigation
hook to disable Ajax navigation if the default language selector in the footer uses regular page refreshes instead of Ajax requests. This hook can be found here: wpml_ls_enable_ajax_navigation.
If these steps do not resolve the issue, or if the solution seems outdated or not applicable, we highly recommend opening a new support ticket. Please check related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. For further assistance, you can also visit our support forum: WPML Support Forum.
