Hello everybody, Let me answer the questions first: *Which version of the game did you purchase? STEAM or RETAIL or MIXED: RETAIL (NON-STAM) *Are you running an Arma 2 OA beta patch? If so what version?: Yes and 9.4444 *Which method are you using to launch the game? I.E Sixupdater/steam/batch file: I tried Sixupdater and batch file. *What is the Error/Problem you're having? Please provide screenshots if possible: When I want to join to a server I get two kind of error message: 1. "You were kicked from server" 2. Files: ...... are not signed by a key accepted by this server. *Your PC specs: I5-2500k CPU GTX 570 GPU 8 GB ram *Your Operating System: Windows 7 64-bit *Have you looked at these threads?: YES. And this what I've tried: First of all I read a lot of forum threads about these problems. I tried a lot of methods to solve it but no one help me. 1. Install Arma II game from DVD. Next install ArmA II 1.04 -> 1.05-> 1.11 patches. After I install Arma II Operation Arrowhead from DVD. Next I install the newest beta patch 9.4444. After I download from torrent the DayZ . I create a folder in ArmA II folder what is: "@DayZ". In this folder I create an "Addons" folder. I copy the downloaded DayZ files to the "Addons" folder. After this I make a right-click on shortcut "Launch Arma2 OA Beta Patch". Add "-mod=@dayz" without quotes to the target line. I click on this shortcut on the desktop, the game run. I can see in the right "@dayz" "Expansion" "beta". I go to multiplayer, use the filter to "dayz". I try to connect a lot of servers and get the error messages. 2. Install ArmA II from DVD. Next install ArmA OA in the same folder (default). Let it to patch automatically. After I download six-updater, install it, run it. Verify the game, download DAY-Z, try to connect servers and get the same error messages. I also reinstalled Battleye, download the newest. tl;dr: I tried these methods: http://dayzwiki.com/wiki/index.php?title=How_to_install_DayZ#ARMA2_Beta_patch And none of them working. I tried these: - about 5 times install reinstall, try to solve the problem different methods - also Battleye reinstall (the newest) but not working. - run as administrator, didn't work. - to turn off Windows Firewall, didn't work. I get the errors before I can play on any server.