In T173690#2468412, @Nate_LapT wrote:

make sure your firewall isn't blocking dayz.

Most likely blocking dayz talking to steam. ports should be 27015, look through your firewall for similar and add dayz to the exclusion list.

In T173690#2468176, @JerseyD911 wrote:

Try alternative DZSALauncher, I have same thing, but only for some servers