The host ran at nc.games.la called Ninja Classic, is ceasing operation on the 30th of November 2017. Now don't be too alarmed by this as your accounts are being transferred to their new domain www.plaync100.us called Ninja World Online. If you do not play on nc.games.la you don't have to do anything, if you however do, you will need to transfer your account to the new host. I will go over how you do that below.
First of all when you launch the game like you normally would you will most likely get a popup that looks something like this. If you don't see this there is an icon in the left side of Konoha Village you can click on to manually open this.
In here you type in email and password you wish to use on the new host(this does not have to be the same as your current account) this will be your new login. Click Submit.
Once you have done this you are done with the transfer and are ready to jump over to the new host www.plaync100.us.
Here all you have to do is login, open the server list followed by selecting the server you normally play, and done. You're now logged in to the new host with your old account.
Note: If you have multiple characters on your account, say Server 1 and Server 5. Both will be transferred to the new host, you do not need to transfer twice.
Note 2: You can continue playing on nc.games.la until that domains shuts down on the 30th of November.
Note 3: After logging in on the new host you will have a reward in your mail.