This is the link where i found the fix:
Combat Arms - ATTN: Players receiving "Conneection to Server has Ended" Error
So basically, it seems that Combat Arms NA black cipher dll's are broken. So the way to fix it, is to download Combat Arms from a different region. I downloaded mine from CA EU.
Here are the dll's from EU, so just replace the Black Cipher dll's you currently have with these attachments.
VS
Thank if it helped.