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disabled guest account still gets locked

Posted on 2014-01-24
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Last Modified: 2014-03-28
sbs 2003.  i have the default guest account disabled however, malicious bots try to authenticate with my smtp server using this guest account.  after the defined number of failed attempts i get 539 account lockout events for the guest account in the event log.  i don't understand why i get a lockout when the account is disabled.

i tried to duplicate this by loging onto my smtp server via telnet to port 25, ehlo, auth login command but the base64 that i use for "guest" (online decoder) results in a "guust" account login in the event log.  i'm not sure what i'm doing wrong here but what i'm trying to figure out is why do i get an account lockout on a disabled account?

any ideas
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Question by:scraby
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Expert Comment

by:Will Szymkowski
ID: 39806567
I am not sure how they are trying to authenticate to your Exchange Receive Connector using Guest Account but typically it is a best practice to rename both the guest account and also administrator account. Have you tried to rename the guest account? You can do this via GPO

Rename Guest and Administrator Account GPO

Will.
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by:scraby
ID: 39806782
well, neither of these answers my question of how a disabled account is getting locked out?  i renamed the guest account anyway.
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by:Will Szymkowski
Will Szymkowski earned 250 total points
ID: 39806827
What do the logs say in regards to the lock out? Do they give you a source IP or anything in relation to that? Maybe it is a Guest Account on a different machine.

Anyways renaming the Guest account should be done as a best practice. Check and see if the account continues to get these error messages.

Will.
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compdigit44 earned 250 total points
ID: 39813668
Have you enabled verbose SMTP logging?
Have you checked your firewall logs?
Are you sure the source of the attack is external and not internal?
On your IIS SMTP virtual server, what are your relaying settings set to?
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