JvkeOS I suspect some sort of Web Application Firewall your website uses has blocked the IP of my Lab server.
I can reach the website fine from my local ISP in Switzerland and from another DigitalOcean droplet in Germany in the same datacenter as the lab. However the website doesn't respond when queried from the DigitalOcean server that hosts the lab.
I tried reaching the website with curl
via the command line and even with 2 minutes time out it still didn't respond.
It's probably an IP block and not based on the user agent because the Lab uses a custom user agent, yet curl failed on the first try as well with a different user agent.