We're currently running ESET NOD32 Business Edition with around 132 Nodes version 4.0.474.0, Server version: 3.1.15. Starting sometime last week, i've been getting these random machine messages: During execution of Update on the computer XXXXX-XX, the following warning occurred: Invalid Username and/or Password. It's random, no changes have been done to the server, error is emailed once every hour. The only fix I've found is actually logging onto the computer itself, bringing the Advanced Setup Tree -> Update -> Clicking on the Clear cache button and rebooting. But why would this be happening all of the sudden? Same setup has worked correctly for almost two years. I am just concerned that they will all go at the same time.