logwatch mesgs about crond

[Harry Putnam]

I've been having a problem with cron dying unexpectedly.  I haven't
worked real hard at debugging it yet but I did run accross these
messages in mail to root from `logwatch'
(wrapped for mail)

  ------------- Connections (secure-log) Begin ---------------

  **Unmatched Entries**

  crond[20751]: pam_succeed_if: requirement "uid < 100" not met by user
  "reader"
  crond[20853]: pam_succeed_if: requirement "uid < 100" not met by user
  "reader"
  crond[21051]: pam_succeed_if: requirement "uid < 100" not met by user
  "reader"
[...]

I have about 300 of them in last message from logwatch and similar
numbers in several others.

Any one know for sure what they mean?