Hi,
Based on the error message, it seems to be network relate, network configuration including DNS, profile type, 3rd party process and etc. factors may causing such problem.
Have your tried to reboot after updating? Also once problem happens, please force quit background process on Mac. Then, try to establish RDP connection again to check the result.
Also is the remote connection using the host name and IP not successful both?
Hope this helps and please help to accept as Answer if the response is useful.
Best Regards,
Carl