When there is a failure in the On-Premise Poller communication, you will get the following message: Site24x7 On-Premise Poller service <name> could not establish communication with the Server. Kindly check if there is a problem with the Network Communication. This could also happen if the Site24x7 On-Premise Poller Service or the host itself is down. In this case, you can check the accessibility of Site24x7 server from the On-Premise Poller