Problem accessing to the trial version of Intellij with proxy

Hi.

When connecting to a new installed Intellij 2021.3.3 version for the first time, if I click to "start trial -> Log in to JetBrains Account", I've got a timeout some minutes after. I'm working on a computer that access Internet via a Proxy connection. The help site proposed then when clicking on the fail dialog does not help either, because the given link refeers to a list of licenses to be bought, and not a trial one. (https://intellij-support.jetbrains.com/hc/en-us/articles/4407356204178-IDE-Can-t-Connect-to-JetBrains-Account)

I can bypass the trial option and directly buy a license, if needed, but I'm afraid it thoesn't work either for a payed license. 

I've tried all kind of proposed sollutions, like modifying the net.properties file to add the proxy configuration, or adding "-Djba.http.proxy=http://my-proxy.com:port". No way,

Thank you very mach for your help