Undefined constant “SECURE_AUTH_COOKIE”

Hi, since a few days I’m getting 500 Internal Server errors when accessing the Site Editor on a sub-site. The full error is:

[06-Nov-2023 16:32:03 UTC] PHP Fatal error:  Uncaught Error: Undefined constant "SECURE_AUTH_COOKIE" in /var/www/xxx/htdocs/wp-includes/pluggable.php:929
Stack trace:
#0 /var/www/xxx/htdocs/wp-includes/pluggable.php(694): wp_parse_auth_cookie()
#1 /var/www/xxx/htdocs/wp-includes/class-wp-hook.php(310): wp_validate_auth_cookie()
#2 /var/www/xxx/htdocs/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#3 /var/www/xxx/htdocs/wp-includes/user.php(3622): apply_filters()
#4 /var/www/xxx/htdocs/wp-includes/pluggable.php(70): _wp_get_current_user()
#5 /var/www/xxx/htdocs/wp-includes/l10n.php(98): wp_get_current_user()
#6 /var/www/xxx/htdocs/wp-includes/l10n.php(152): get_user_locale()
#7 /var/www/xxx/htdocs/wp-includes/l10n.php(1300): determine_locale()
#8 /var/www/xxx/htdocs/wp-includes/l10n.php(1331): _load_textdomain_just_in_time()
#9 /var/www/xxx/htdocs/wp-includes/l10n.php(185): get_translations_for_domain()
#10 /var/www/xxx/htdocs/wp-includes/l10n.php(330): translate()
#11 /var/www/xxx/htdocs/wp-content/mu-plugins/wp-multi-network/includes/classes/class-wp-ms-networks-admin.php(176): esc_html__()
#12 /var/www/xxx/htdocs/wp-content/mu-plugins/wp-multi-network/includes/classes/class-wp-ms-networks-admin.php(35): WP_MS_Networks_Admin->set_feedback_strings()
#13 /var/www/xxx/htdocs/wp-content/mu-plugins/wpmn-loader.php(159): WP_MS_Networks_Admin->__construct()
#14 /var/www/xxx/htdocs/wp-content/mu-plugins/wpmn-loader.php(106): WPMN_Loader->includes()
#15 /var/www/xxx/htdocs/wp-content/mu-plugins/wpmn-loader.php(218): WPMN_Loader->__construct()
#16 /var/www/xxx/htdocs/wp-content/mu-plugins/wpmn-loader.php(190): wpmn()
#17 /var/www/xxx/htdocs/wp-includes/class-wp-hook.php(310): setup_multi_network()
#18 /var/www/xxx/htdocs/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters()
#19 /var/www/xxx/htdocs/wp-includes/plugin.php(517): WP_Hook->do_action()
#20 /var/www/xxx/htdocs/wp-settings.php(427): do_action()
#21 /var/www/xxx/wp-config.php(101): require_once('...')
#22 /var/www/xxx/htdocs/wp-load.php(55): require_once('...')
#23 /var/www/xxx/htdocs/wp-admin/admin.php(34): require_once('...')
#24 /var/www/xxx/htdocs/wp-admin/site-editor.php(12): require_once('...')
#25 {main}
  thrown in /var/www/xxx/htdocs/wp-includes/pluggable.php on line 929
[06-Nov-2023 16:32:03 UTC] PHP Fatal error:  Uncaught Error: Undefined constant "SECURE_AUTH_COOKIE" in /var/www/xxx/htdocs/wp-includes/pluggable.php:929
Stack trace:
#0 /var/www/xxx/htdocs/wp-includes/pluggable.php(694): wp_parse_auth_cookie()
#1 /var/www/xxx/htdocs/wp-includes/class-wp-hook.php(310): wp_validate_auth_cookie()
#2 /var/www/xxx/htdocs/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#3 /var/www/xxx/htdocs/wp-includes/user.php(3622): apply_filters()
#4 /var/www/xxx/htdocs/wp-includes/pluggable.php(70): _wp_get_current_user()
#5 /var/www/xxx/htdocs/wp-includes/l10n.php(98): wp_get_current_user()
#6 /var/www/xxx/htdocs/wp-includes/l10n.php(152): get_user_locale()
#7 /var/www/xxx/htdocs/wp-includes/l10n.php(894): determine_locale()
#8 /var/www/xxx/htdocs/wp-includes/class-wp-fatal-error-handler.php(47): load_default_textdomain()
#9 [internal function]: WP_Fatal_Error_Handler->handle()
#10 {main}
  thrown in /var/www/xxx/htdocs/wp-includes/pluggable.php on line 929

When I rename mu-plugins/wpmn-loader.php to wpmn-loader.txt to disable the plugin, the issue disappears.

WP Multi Network has been installed and running without issues in mu-plugins for many years. It was updated to the latest version 2.5.2 a long time ago but this issue only started a few days ago.

Disabling all other plugins on the sub-site except those that are active network wide, does not fix it. I’ll try to find out if this is a conflict with any of the network activated plugins and come back here if/when I found out more.

In the meantime: does anyone have any idea where this could come from? Is it a known conflict?

• This topic was modified 1 year ago by Rolf Allard van Hagen. Reason: fixing incomplete error log