My friend had a problem

[Bunines]

He said that he is banned when he try to go to the server said scheduled maintenance, please see http://mcgamer.net for more info

I'm going to wait you answer

 

[Captain Dory]

If a message comes up saying "Scheduled maintenance"
I can assume there is maintenance happening at the moment.

 

[StarWilly12]

What your friend perceived to be a ban was the previously scheduled network maintenance as explained in this thread here.
QA;TL
Feel free to message me with any further questions or concerns.