Remote Desktop Connection failed to connect to the Remote Computer

Hello
I am getting this error message when I try to fix to our remote Database via Remote Desktop Connection.
What should I do now?
Please help.

Remote Desktop Connection
I searched in online, and I got an answer that this may be from Firewall, but this is not accurate.
That’s why I am asking you to give a solid answer. I need to solve it quickly.
Please help me to get rid of it.
Thanks.
