Screen android no connect

Hello good day.

I have a problem with a screen (android).

I tested and it worked. Step 1 month and now it does not work.
No slides appear, still loading old slides as if it did not connect to the server.
I get a message on screens:
“The screen is out of date, but has not yet been checked with the server”

I do not know what problem it can be.

-CMS: version 1.7.9

Greetings and thank you.

Could you please make sure that your display has reliable internet connection and can reach the CMS (test in the browser on this device), perhaps show us a screenshot of status window on your device, if there is some kind of problem is should be listed there.

Could you check date&time settings on your device please, as the ‘Checked at 2011-01-01’ does not seem to be correct.

Please set the date&time to automatic, if the device has reliable internet connection.

OH MY GOD!!!
That was the problem!!
Thank yo very much.