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RDP Server Land Attack

I've been receiving a few of these alert messages every other day for a week. I have a Sonicwall TZ210W firewall.

The firewall has the latest firmware and appears to be working properly.

04/07/2014 13:32:27.880 - Alert - Intrusion Prevention - Land attack dropped -       x.x.x.x, 11, X1 - x.x.x.x, 11 -

Any idea where to start?
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Tony Giangreco
Asked:
Tony Giangreco
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1 Solution
 
Lee IngallsDirector of IT/TS, Quality and FinanceCommented:
I have the same Sonicwall TZ210...

A dropped event is a service that is denied entry into the SonicWALL because it
violates configured or default security policies. No response is returned to the sender of the  event.

"Land Attack Dropped - The SonciWALL has detected and blocked SYN packets whose
source IP addresses are spoofed to be the same as the destination IP addresses".

Review:
Firewall Service Objects
Security Services - Intrusion Prevention - IPS Policies

Are you doing VoIP?
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Tony GiangrecoAuthor Commented:
So if this starts happening constantly, I'd assume we are having a Doss attack. if not, it's just something to ignore since we don't have an origination IP. Correct?
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Lee IngallsDirector of IT/TS, Quality and FinanceCommented:
It's dropping the event without response to the originating sender. I'd say monitor and report to your Service Provider should it persist... since you'd prefer not to have that traffic at all.

I was having similar for a period of time and said something to my provider near contract renewal time and haven't seen them since.

Are you using RDP or Terminal Services through your firewall?
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Tony GiangrecoAuthor Commented:
Yes, we have five servers. 3-DC, 1 Exchange and 1 RDP/Terminal Server
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Lee IngallsDirector of IT/TS, Quality and FinanceCommented:
Make sure it's not a mis-configured or unstable RDP/TS client causing the SYN packet flood; otherwise it's most likely not a targeted DOS but rather random probing on your service providers subnet looking for unpatched MS RDP vulnerabilities.

"Your Sonicwall is stopping it at your front door; but your service provider can keep it from walking up your driveway."
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Tony GiangrecoAuthor Commented:
Ok, the RDP server is a Windows 2008 r2 and all Microsoft updates have been applied to it. it' running Symantec Endpoint Protection and we have the RDP port changed so it is not a standard port that's being used.

Do you have any other suggestions that I should look into?
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Tony GiangrecoAuthor Commented:
I contacted Sonicwall support. The firewall is dropping this traffic as it's designed to do. If it continues, I'll need to contact the ISP and see if they can block it from their side.

Thanks for the info.
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