Certificate invalid date

Hello, every time i want join one server that is show up to me. Can somebody help mi with that please?

“The server is modified or outdated and we do not allow you to connect to it.”

I’m having this issue since this morning (local time 11AM Buenos Aires). Server is rented from ts3.lu, tried restarting server, reinstalling also, no luck.

Looking on internet, this is a recurring issue when changing server versions. Anything I can do besides waiting for the company I rent it to fix it?

The company is using modified servers and we do not allow to connect to these.