Merci pour vos réponses.
Je suis aussi en contact avec l'équipe themepunch, voici leurs réponses :
we noticed that some server connections from OVH are blocked, which are coming over from France to Germany. The last connection ends at a hop from Host Europe. We don’t know if this is an DNS issue on OVH side or maybe an issue at Host Europe.
This issue affects the registration process for our products.
After several phone calls with the OVH support, we are a little bit stuck on our end. Best thing is, to raise a connection issue ticket directly as OVH customer within their ticket system, to get things resolved quickly.
Please contact your hosting provider for help and request a MTR trace to our subdomain urls:
The MTR traces will show, that the connection to our servers can not be accomplished, regardless of the whitelisting.
We are sorry that we cannot help out further, beside giving out connection issue details to the OVH support from our end.
We did some traces too from our location, and it seems that something is weird. We can connect to your server, but also the last hop before your server ip adress seems to be not responding.
Seems that sometimes the connection is flawlessly, and sometimes the connection is faulty for some reason."