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Auditing Failed Login and Alert


Auditing Failed Login and Alert

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Steve Jones
Steve Jones
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I think this is possible, but if someone can create a technique, I'd like it.

Can you track failed logins, perhaps every five minutes, and if there are 3 failed logins for a user in that time, send an email?

I'm guessing extended events is the way to do this, with some trigger that queries the session, looking for a count()>3 in the time period? Maybe an OVER() with the user and time period, getting a row_number() in the partition >= 3?

Let me know if someone can tackle this and make it work.

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Shawn Melton
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I can probably tackle this rather quickly. I already did part of this for a client last week, minus the alerting it was just to capture failed logins.

Shawn Melton
Twitter: @wsmelton
Blog: blog.wsmelton.info
Steve Jones
Steve Jones
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That would be cool if you have something. It's a neat idea, especially as using something like SCOM is more like a .44 against houseflies.

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Kristen-173977
Kristen-173977
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Presumably reading the SQL Error Log to find the failed logins is completely unrealistic in practice? (i.e. using xp_readerrorlog and having turned on Failed Login auditing for the instance)

P.S. I stumbled over this "Using SQL Server Extended Events to capture failed logins" half way down the page

http://www.sqlshack.com/using-extended-events-review-sql-server-failed-logins/
Steve Jones
Steve Jones
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The error log is impractical. You'd be reading the entire log every 5 mninutes, trying to sort through text entries.

Follow me on Twitter: @way0utwest
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