Error " Unable to establish a connection to rdp server ... " when connecting via Remmina. What to do?

Question

linux

Yesterday, the first day I successfully worked remotely using a Linux image and the Remmina program to connect to a working PC. I successfully worked all day and even a little at night, but when I woke up in the morning I came across the error "Unable to establish a connection to rdp server".
Before that I tried to work through a laptop based on Windows using "Remote Desktop Connection", there constantly appeared a warning "an internal error occurred", when trying to navigate to my IP and I could enter by asking one of my colleagues to enter my password and again block the account, after which it worked for 20-30 minutes, at best a couple of hours and everything was cut off without the ability to independently connect on a new one.