Port scanning.. should i be concerned ??

keat63

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Nov 20, 2014
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Chaps.

I installed CSF this afternoon and can see 3 servers which have been port scanning.
All 3 servers are in the same data centre as my server.

all on the same subnet range

lets assume i'm on xxx.xxx.221.199
The 3 other servers were

xxx.xxx.221.8 11 hits in the last 161 seconds - *Blocked in csf* for 3600 secs
xxx.xxx.220.18 11 hits in the last 166 seconds - *Blocked in csf* for 3600 secs
xxx.xxx.220.23 11 hits in the last 276 seconds - *Blocked in csf* for 3600 secs

When i try to connected to these ip's in my browser each one is showing some form of iis7 landing page with a blue logo and welcome in various languages.
 
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keat63

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I actually called the server provider, to ask if these servers were anything to do with them, maybe DNS servers or similar.
The guy confirmed that they are indeed their servers, but these are other customers servers.
I've checked again this evening and it seems that CSF has blocked them permanently
 

Serra

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Oct 27, 2005
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As for the question, "Should you be worried?" No, you should not be worried. Port scanning is a very easy task for script using hackers. On a secure server, it really isn't all that useful or dangerous.
 

quizknows

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Oct 20, 2009
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Generally when I get reports like these in my data center, it is because the other customers have dropbox with the lansync feature enabled. Lansync sends out tons of broadcast traffic. Likely that's what it is; I'd just block them. You can be sure if your logs show port 17500 that it is dropbox and not intentionally malicious.

I usually see it on windows servers, which is consistent with you seeing IIS.
 

cPanelMichael

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Apr 11, 2011
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I've checked again this evening and it seems that CSF has blocked them permanently
Right, as mentioned, the scan itself is relatively harmless. Note that if you are concerned about overall security of your system, the Security Advisor is a good place to start:

Security Advisor

Thank you.