If you are not able to join any server and you are getting kicked by fairfight, then it could be possible you have been banned. In that case, you should check out the link below, nobody else can assist you with this issue on the forum.
Hello AmouranthVietNam,
You should join servers from inside of Battlefield 4, Battlelog is not supported anymore and could be causing the issue. Also, you can try reinstalling your game if the issue persists.
I tried join from menu and received that error above, also tried reinstalli, didn't work
I think that some kind of ban, bf4db said I was clear so it must be fairfight ban, how do I check fairfight ban status?
By the provided error, it does not seem like a ban. You can check your bans on the following link just in case.
Are you joining specific servers or are you using quick match?
When I joined via quick math, it showed error code 1
When I joined via browser or favorites, it showed kicked by fairfight
