warning 661 filemaker

i get an email from filemaker server 9 says "warning 661 admin fmapp couldn't login xxx.fp7".
do you know what i should do?
I set a function to receive a warning and alert email from server.
is this why i get this alert every time user fail to login?
Hiroyuki TamuraField EngineerAsked:
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PeterMacCommented:
Yes, warnings appear to be due to way FileMaker authenticates, and do not neccessarily mean there was any problem with the login. If you google for error message, "Warning 661" you will pick up lots of forum discussions on the subject. Have not found any solution to this, other than turn off warning e-mails.
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Hiroyuki TamuraField EngineerAuthor Commented:
thank you.
i see lots of failure logging in to guest account.
does this mean somebody trying to hack?
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PeterMacCommented:
Possible, but more likely would be an opener file that automatically logs in with low level "guest" account, that does not have access to main application. When "guest" login fails will just open up normal login for user, so they will not see any problem.
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Hiroyuki TamuraField EngineerAuthor Commented:
thank you.
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