Hmmm...seems like you have the same problem as me
If you do, then eventually you wont even be able to log in and it will give you errorcode: 0 lol
When you get that (or before, like now) you can do the following: (from first to last)
1) Test if another account works o.k. on your computer
2)Restart your computer and try to see if it stop kicking you (or if you have ErrorC: 0 that it goes away)
3)Download the manual update from nexons site (Combat Arms - 404 Error try to update it again
4) Contact Nexon?