How to prevent Passwords displayed in clear text in logs?

Hi, I'm using ASG 8.2.
as I changed the configration of the web proxy of the Up2Date function,
I discovered that the password appears in clear text in the log
Management - System overview - Current Session - show changes:

Name                                  Time  O                     ld Value New Value
Up2Date proxy password 2011:11:21-16:09:00 1234         5678

How can I delete this info (and prevent this in the future?)

Thank you all!

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