1. Reboot your computer
2. Launch Combat Arms and see if you still get disconnected. If you are, proceed to Step 3.
3. Erase the HShield folder and all files within. This folder can be found in the Combat Arms installation folder (usually located in the C Drive - C:\Nexon\Combat Arms)
There are 3 step to repair combat arms 204 error
My friend had the same problem with you. I am sure your computer has registry problems.It is very easy to repair combat arms 204 error. you just need 3 steps:
1: Download a registry cleaner and install it, note same will scan for free, but not fix for free
2: Open the registry cleaner and scan you computer for free. Note like I said above some will not fix for free.
3: Click fix button and you done.
Tell me if it works..