Have you ever seen one of these before in your logs? They pop up from time to time:
The following fatal alert was generated: 10. The internal error state is 1203.
They aren’t anything to worry about. It just means a client somewhere is trying to access something using the wrong protocol. For example, someone is trying to log into OWA using http instead of https. That’s all. These can essentially be ignored unless there are outrageous amounts or something is breaking during the attempts.