How to correct this error?

Every morning, looking into “Administration Requests” db, I see several messages of this type:

“Title: Xxx’s Directory File name: names.nsf; Error: The signature in the Change Password field was found to be invalid”

One for each of some users: I don’t understand which users cause this message and why… I don’t thing these people is going to change it’s password every morning… there must be some “old” reason that comes out every morning, I suppose.

Can you advise me what to look for and how to correct this problem?

Thanks, Frank

Subject: Look in the Kbase

Look for techotes named : AdminP error during processing of password change requests