On some action Windows Server 2012 go stuck and when again take the remote it was showing blue screen. Below steps helped me to fix the issue. If this is issue on your application server etc. perform these after working hours.
1. Take the remote of machine which you are facing the blue screen issue.
2. When blue screen appear press Ctrl, Alt and End keys.
2.2. If you don't have End button visible on your key board you can use MS On-Screen Keyboard.
3. After pressing the keys, in Windows server remote Windows will show default options like Sign Out etc.
4. Simply click on Sign Out. Remote will be disconnect.
5. Give it few seconds and re take the remote session of that machine.
6. Windows will login a new session and you can continue your work.