Activation key error – cURL error 28 when connecting to gvectors.com

Hello,
I’m having an issue activating my wpForo add-ons.
I have purchased the add-ons and entered the activation key correctly in the wpForo admin panel, but when I try to activate them, I always get the following error message:
Something went wrong: cURL error 28: Failed to connect to gvectors.com port 443: Connection timed out
Additional details:
* The add-ons are installed and enabled in WordPress
* The problem occurs only when entering the activation key
* My hosting provider is Infomaniak
* Outbound HTTPS connections should normally be allowed
* No firewall rule has been intentionally added on my side
It looks like my server cannot reach gvectors.com on port 443, but I’m not sure whether this is:
* a hosting-related issue,
* a temporary connectivity issue,
* or something specific to the activation process.
Could you please advise on:
* required server settings (PHP, cURL, SSL, firewall, IP whitelist, etc.)
* or an alternative/manual way to activate the license if needed?
Thank you very much for your help.
Best regards,
Aïmata