So it's no surprise that one morning he finds this message from someone on the help desk:

Seems that Branch X has dropped everyone's connection at 3:35 the last four days in a row. I checked the error log and see that a display adapter configuration error has popped up at the same exact second each day! Not sure how that works, but can one of you check on it to see what might be causing it? Faulty video card? Thanks!

A faulty video card doesn't sound likely to fish -- not if it's happening at exactly 3:35 p.m. every day.

But he knows some of the systems do share console monitors and keyboards through physical switches. And he knows that some of the servers automatically run a file cleanup task every morning, finishing up the process by rebooting.

Fish gets into Branch X's system via Telnet to check something. Then he sends a reply back to the help desk: