For several days I was perplexed by an Avamar backup job that continually failed.  The backup source was a simple Windows application server which was running perfectly with no noticeable faults.  The Avamar server was lending little help in finding the solution either.  The message "...backup failed with exit code 10019: Externally cancelled by Administrator " were all of the clues I had to find a solution.  I knew for a fact that no "administrator" had cancelled the job, so that left me puzzled.  In fact, it wasn't until I opened the Avamar client work order log on the Windows server that I began to unravel the mystery.

Within the work order log contained a status code, 30900, and a more specific error number 10013.  After a few minutes of research, I was able to determine that the job was "cancelled" due to it not completing before the backup window expired.  I went back and checked the time in which the job started, and sure enough, the job started just before the end of the backup windows.  A quick modification to the window, and the job is now completing successfully.