The security token is missing from your request - Keeps redirecting back

Hi, Yesterday one of the servers at our datacenter which has cPanel/WHM installed had a network card blow out so we had to migrate to a new server. Since then users are always getting the: " The security token is missing from your request. " The error which doesn't accrue on WHM the only cPanel. Yet I read online to clear browser cookies but It seems that the issue is server-wide not only myself. Even when reentering the cPanel password it directs to the cpanel url with a token in, then before anything shows go straight back to the login screen, and does it constantly completely disabling cPanel access. Does anyone have any ideas on a fix? It has stopped many clients being able to log in. Regards!