This is more for my memory that anything else but I thought I'd share it because it often comes up in comments, but is not in the InterSystems documentation.
There is a wonderful utility called ^REDEBUG that increases the level of logging going into mgr\cconsole.log.
You activate it by
a) start terminal/login
b) zn "%SYS"
c) do ^REDEBUG
d) change logging level to FFFFFFFF
if you are on you production system (with lots of traffic) I suggest you quickly reproduce the error, rename the cconsole.log file, and repeat the steps above to set the logging level to FF.
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