If an error saying 'internal server error' occurs as soon as you try to connect to remote desktop, it is most likely due to a setting a Windows Update has introduced to lower the amount of requests to stop endless attacking on RDP ports.

If you are receiving this message when trying to login, you can generally login if you keep trying. However, there are a few ways around this:

1. Limit the IPs that can connect to remote desktop in the Windows Firewall to stop hackers from being able to attempt to login.

2. Make sure that Network Authentication Only is set in the remote desktop settings. This may reduce hacker attempts at accessing your RDP server.

3. Change the maximum outstanding connections limit. This is done in the registry at:

Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\MaxOutstandingConnections

You will need to go to regedit.exe and browse to:

Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\

Then create a DWORD value called: MaxOutstandingConnections

Give it a Decimal value of 3000