I will copy and paste what I said to you in the last thread.Until you can confirm these then helping you is going to be a longer process.
1. Make sure you ain't trying to join the Operations & Training server. It is currently offline. If so try the public.
2. Double check all repos are up to date. If trying to join the public server make sure you've got the public repo selected and not the OP repo just incase it's possibly causing issues.
3. If you are on the screen where it's trying to join the server and all the above is okay, then just wait.
Arma is like a baby... It still has to learn to walk and talk. Go make a cup of tea and come back in 10.
Let me know what happens.
You're Arma sync should look like mine.