Event log message size 31885? Windows 2008

0x19 corresponds to 19 in hex notation which is 25 in decimal: "Additional pre-authentication required*"

An admin who doesn't monitor the event logs (or equivalent an non-Windows systems) is not much of an admin. However, there are many different ways and means of monitoring the logs and because they are cryptic at best the monitoring is best done programatically. That doesn't remove the need for periodic random manual checks but certainly makes a large complex job manageable.

The key to this is a program (or suite of programs) that will pares the logs and extract the "interesting" bits. e.g. Why would we normally care that Betty sent a 50 page document to the Accounts HP printer, yet the logs are chock full of such stuff. The vast majority of event log entries are of no real concern to the day to day operation but can be very helpful when trying to isolate or debug problems.

Use the filter extract the errors and warnings and then possibly even drop those that are normal and expected on a given system. Once you get this filtered down properly you should end up with a reasonably small number of events that require further investigation. Or at least one would hope that is the result.