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Intrusion Prevention Alert

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Hi,

I receive multiple message like this and Im worrying:

Quote:

Intrusion Prevention Alert

An intrusion has been detected. The packet has been dropped automatically.
You can toggle this rule between "drop" and "alert only" in WebAdmin.

Details about the intrusion alert:

Message........: FILE-OTHER RealNetworks Netzip Classic zip archive long filename buffer overflow attempt
Details........: Snort ::
Time...........: 2013-02-21 17:48:01
Packet dropped.: yes
Priority.......: high
Classification.: Attempted User Privilege Gain
IP protocol....: 6 (TCP)

Source IP address: 217.212.239.25 (217-212-239-25.customer.teliacarrier.com)
- Professional Toolset | DNSstuff
- Database Query
- http://ws.arin.net/cgi-bin/whois.pl?...217.212.239.25
- APNIC - Query the APNIC Whois Database
Source port: 80 (http)
Destination IP address: x.x.x.x
- Professional Toolset | DNSstuff
- Database Query
- http://ws.arin.net/cgi-bin/whois.pl?queryinput=x.x.x.x
- APNIC - Query the APNIC Whois Database
Destination port: 49357
Someone can said me what happens? It's an attack?
I don't know if is relationed with WSUS.

Thank you so much!

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