Hello svetistrpo,

To begin with I would recommend that you try to verify the integrity of the game cache:

1. Start Steam and right click on DayZ in your game library (make sure that the game is not running).
2. Select the tab labeled "Local Files".
3. Click on the button labeled "Verify integrity of game cache...".
4. Start DayZ once the process is complete.

If this does not solve the problem, then you can try the following steps:

1. Move the entire "C:\Program Files (x86)\Steam\SteamApps" folder to your desktop. Your "SteamApps" folder should now be at the following location: "C:\Users\<username>\Desktop\SteamApps".
2. Move the "DayZ" folder out of the "C:\Users\<username>\Desktop\SteamApps\common" folder and subsequently delete the "DayZ" folder.
3. Uninstall Steam while making sure the "SteamApps" folder is still on your desktop.
4. Install a new version of Steam.
5. Go to the new "C:\Program Files (x86)\Steam\SteamApps" folder.
6. Move everything inside the old "SteamApps" folder on your desktop to the new "C:\Program Files (x86)\Steam\SteamApps" folder.
7. Install DayZ again.

In case this does not solve your problem either, I can have a look at your account in the character database if you send me a link for your Steam Profile ID.

Regards,
JStewart

I already tried all..

My profile http://steamcommunity.com/id/Svetistrpo_CRO

We checked your account and all seems good. Please try the following steps:

1. Uninstall DayZ and Steam.
2. Manually delete the "C:\Users\<username>\Documents\DayZ" and the "C:\Users\<username>\AppData\Local\DayZ" folders.
3. Reinstall DayZ and Steam.
4. Launch DayZ and see if you can connect to the game servers.