I can not connect to my Google Cloud server with RDP

I have a Google cloud server. I use it for months. I always connect to it by downloading the RDP files and it always worked.

But today I get this error message when I try to enter a picture description

I did not change any settings, I tried everything, reset the server, created a new instance, disabled my firewall, nothing worked …

Can you help me please?

Many Thanks,

Roméo