Erreur Rss : WP HTTP Error: cURL error 7: couldn’t connect to host

Hello,
I am having troubles with my website [ redundant link removed ] recently and honestly don’t know what to do about it. I have started the website in 2008 and renewed my hosting at ovh each year.

The website works with the WordPress 4.7.6 and the Holly Theme.

I can’t do any updates, install theme or plug ins.
I have activated the SSL (which I didn’t have before) on my ovh account which I didn’t have before.

Here are the error messages that I have :
– WP HTTP Error: cURL error 7: couldn’t connect to host
– Une erreur imprévue est survenue. Il pourrait y avoir un problème avec www.ads-software.com ou la configuration de ce serveur. Si vous continuez à rencontrer ce problème, veuillez vous rendre sur le forums d’entraide (en anglais).
– WordPress ne rapporte aucun support pour SSL sur votre site

Is there something we can do to fix this bug ?

Have a great day,
Valérie Fiala

The page I need help with: [log in to see the link]