In T124922#1609764, @Geez wrote:

Hello KAMaToZzzNiK.
Show them the screenshot with the error message and describe your problem (that you are getting diconnected from servers with NoLicenceOrExpired error when you are attempting to play DayZ).
Regards,
Geez

In T124922#1609744, @Geez wrote:

Thank you KAMaToZzzNiK.
This is the full error message we required to see. Have you bought the game on Steam? And if so, can you try to contact the Steam support as well? As it appears that this is an issue with Steam not recognizing the game licence correctly. Please let us know what have they said.
Regards,
Geez

In T124922#1609332, @Geez wrote:

Hello KAMaToZzzNiK.
Are you switching to the experimental version through Steam by right clicking on the DayZ in your library, selecting "properties", navigating into the "Betas" tab and selecting "experimental"?
Regards,
Geez

In T124922#1608757, @KAMaToZzzNiK wrote:

In T124922#1608696, @Geez wrote:

Hello KAMaToZzzNiK.
The current experimental version should indeed be 0.62. Are you certain that this is the experimental version?
Regards,
Geez

Я разобрался, были отключены обновления игры. Я обновился до эксперементальной версии игры, но снова появляется ошибка при попытке зайти на эксперементальный сервер.

In T124922#1608269, @Geez wrote:

Thank you KAMaToZzzNiK.
Yesterday, we have released a new experimental patch (0.62), which should contain more detailed error messages. Can you try to update your DayZ client to experimental version and try to connect to a server and send us a screenshot from the 0.62 version?
Regards,
Geez

In T124922#1607249, @Geez wrote:

Hello KAMaToZzzNiK.
It appears that this is an issue with Steam, however, there should be an extra message in brackets behind the missing string st_mp_steam_auth_failed error (example : missing string st_mp_steam_auth_failed (*reason for the appearance of the error*)). Either way, we suggest to make sure that your Steam is not logged on another computer or that you are not sharing the game through http://store.steampowered.com/promotion/familysharing feature. We also suggest checking your firewall settings to be sure DayZ is not blocked in there.
If you are not sharing the game, are not logged in Steam on another computer and your firewall is not blocking DayZ, try to reinstall Steam. In case the issue persists even upon doing so, please let us know here.
Regards,
Geez

In T124922#1606853, @KAMaToZzzNiK wrote:

In T124922#1606836, @Geez wrote:

Thank you KAMaToZzzNiK.
Is there also something else written besides the "missing string st_mp_steam_auth_failed" or does it show only this exact message?
Regards,
Geez

In T124922#1606836, @Geez wrote:

Thank you KAMaToZzzNiK.
Is there also something else written besides the "missing string st_mp_steam_auth_failed" or does it show only this exact message?
Regards,
Geez

In T124922#1606736, @Geez wrote:

Hello zvukoper and thank you for the report.
Can you please send us a link to the steam profile of the player?
Regards,
Geez