I found an app today i thought id put out there, its free and seems to work a treat
TSplus Add-on: RDP Defender
Why do you need RDP Defender?
If your Windows server is publicly available on Internet, then there is a 100% probability that hackers, network scanners and brute force robots are trying to guess your Administator login and password – as we speak.
Using current logins and password dictionaries, they will automatically try to login to your server hundreds to thousands times every minute.
Not only this is bad for your server’s security, but it can also consume a lot of its resources (CPU and bandwidth)!
How can I protect my server?
Stop the constant attacks right now: install RDP Defender takes less than 30 seconds and will instantly protect your server by monitoring Windows failed login attempts and automatically blacklist the offending IP addresses after several failures. You can of course configure it to match your needs.