1) Please try rebooting the clock. This will need to be done by someone on site, since the clock can't accept remote commands. Hold down the red key for three seconds. Once the clock shuts down completely, Press the red key to bring it back up. Check to see if it reconnects.
2) If the clock is connected via Ethernet, check all of its connections, including making sure that all jacks are firmly seated. If the clock is connected via Wifi, go to Menu >> Comm >> Wireless Setup, and see if you can reenter the password.
3) Check Menu >> Comm >> Cloud Server / Web Setup / ADMS (exact wording depends on the model of the clock). It should have the following settings:
PUSH MODE: ON
IP MODE: ON or URL MODE: OFF (again, depending on model)
Server address: 104.239.247.100
Server port: 80
Proxy: OFF
These settings often get wiped out if the clock is suddenly disconnected or loses power. Once these settings are restores, reboot the clock, give it a few moments to finish syncing and updating, and then resume normal operation.
4) Ask the IT Department if they've made any changes to the network, such as adding a network firewall. If so, they may need the clock's MAC address to white list the device. You can find the clock's MAC address by going to Menu >> Sys Info >> Device. Let the IT deparment know that the clock needs to access 104.239.247.100 via port 80.
If none of these brings about a solution, please let us know, and we can do some further troubleshooting.