This error appears when TaskCentre can't reach the server it needs to connect to. Work through the checks below to identify and resolve the cause.
First, check that your username and password are correct. Then confirm that the TaskCentre Service is running — if the service is stopped, TaskCentre won't be able to connect. If your credentials are correct and the service is running, the error suggests that the SQL server is not reachable. Check that the server name on the login screen is correct and that the server is online and accessible. Ask your IT team to check whether the server is blocked by a firewall. The server the system requires is the one running your Access TaskCentre windows services.