For the past two weeks the ColdFusion scheduled tasks on one of our production servers were not running.  Odd thing is, they could all be run directly from the URL without errors.  When running them manually from the scheduled task window in ColdFusion Administrator they would process without error but not create their desired output - each task writes a text file for use with Active Directory.

After some poking around here is what I found.

I processed one of the tasks and forced it to write the output to a file.  This file showed that permissions within IIS were not working.

*twilight zone music*

The IUSR account on the server was locked.  After unlocking the account the tasks took off like a bird. 

Now I need to find out why the account was locked in the first place.  Should be more fun than a sharp stick in the eye - but only by a bit.