My proxy server is setup to contact active directory for user

For some reason, it is been blocked every night about 1:00am. I cannot find
any error on both machine, and also no cronjob/at job running on the time.
Can anyone advice if there is the way to log the problem? Has anyone have
some knowledge what will cause this problem.

Any comment will be appreciated

Thanks in advance

Julie Xu

Data Communication Team
Information Technology Directorate
University of Western Sydney
Locked Bag 1797
Penrith South DC NSW 1797