in a school environment we have a NW6.5 SP5 server. This server replaced
a NW5.1 server which frequently (~once a month) gave problems with high
utilization and users unable to log in. Now we experience the same
symptoms on the new server.

Today during lunch break while only few users were logged in it happened
again. The utilization went up to 98% and we had to hard reboot the

How can we troubleshoot what actually caused the high utilization?

Thank you,

Matthias, RRDSB