Error 520 calling a perfectly working API

Hello.

There are several posts talking about error 520, but I cannot solve my issue.

On a specific computer, a rented virtual server, I call methods of an API and I always get an error 520. I don’t get that error on any other computers.

This feature here doesn’t allow me to insert a link. It’s pretty tough to ask for help if I can’t give you the API URL … But you can find it probably. It’s the API from AtomicAsset to interact with the WAX Blockchain.

Everything was perfectly working and at the beginning of August, boom, suddenly it no longer works.

Is there a reason why a specific computer would get that error for an API that works perfectly for other people?

I cannot get help from Cloudflare because I don’t have a paying account so I have to ask the community.

Any tips would be appreciated.
Thanks.