Question about Winden license check – repeated HTTP 504 and fatal error on login

Hi DPlugins team,

I’m seeing some intermittent fatal errors related to Winden’s licence check on one of my sites, and I wanted to check whether I might have misconfigured something, or whether there were any issues your side around this time.

On 6 December 2025 between about 08:44 and 09:18 (UK time), attempts to access the WordPress login page (/wp-login.php, using iThemes Security’s hide-backend URL) would occasionally fail with a 500 error. The Apache/PHP error log shows repeated uncaught exceptions coming from Winden’s licence request whenever it receives an HTTP 504 response.

Here’s an example from the logs:

[Sat Dec 06 08:58:19.620804 2025] [proxy_fcgi:error] [pid 3823004:tid 127039268964032] [client 146.198.218.44:0] AH01071: Got error ‘PHP message: PHP Fatal error: Uncaught Exception: Curl request failed: Request failed with HTTP code 504 in /home/storm/sites/kqowu-nimsite-uk/public/wp-content/plugins/winden/App/Helpers/HttpRequest.php:42
Stack trace:
#0 /home/storm/sites/kqowu-nimsite-uk/public/wp-content/plugins/winden/App/License/LicenseRequest.php(22): WindenAppHelpersHttpRequest::post()
#1 /home/storm/sites/kqowu-nimsite-uk/public/wp-content/plugins/winden/App/License/LicenseRequest.php(76): WindenAppLicenseLicenseRequest::make()
#2 /home/storm/sites/kqowu-nimsite-uk/public/wp-content/plugins/winden/App/Admin/License.php(97): WindenAppLicenseLicenseRequest::check()
#3 /home/storm/sites/kqowu-nimsite-uk/public/wp-includes/class-wp-hook.php(341): WindenAppAdminLicense->update_current_state()
#4 /home/storm/sites/kqowu-nimsite-uk/public/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()
#5 /home/storm/sites/kqowu-nimsite-uk/public/wp-includes/plugin.php(522): WP_Hook->do_action()
#6 /home/storm/sites/kqowu-nimsite-uk/public/wp-login.php
‘, referer: https://dulwichprepsenior.org.uk/wp-login.php?itsec-hb-token=****

Could you please let me know:

If there were any known issues or timeouts on your licensing server around 06-12-2025 08:44–09:18 UK time, and

If there’s anything I might have misconfigured (firewall, timeouts, etc.) that could be contributing to the 504 responses?

Happy to provide more log excerpts or environment details if that would help.