Solved

Sonciwall TZ100 Probalbe portscan: what to do?

Posted on 2014-07-28
2
2,338 Views
Last Modified: 2014-07-30
Hi,

I'm overflooded with portscan messages on my Sonicwall TZ100 sn=0017C5A0F194 time=\\\"2014-07-28 13:24:01\\\" fw=82.93.44.x pri=1 c=32 m=83 msg=\\\"Probable port scan detected\\\" sess=None n=43 src=64.15.124.211:80:X1:cache.google.com dst=81.83.190.35:4938:X1 note=\\\"TCP scanned port list, 11261, 3059, 42527, 36803, 41109, 57745, 13935, 5063, 34779, 4938\\\"

Pls advise what to do.
J.
0
Comment
Question by:janhoedt
2 Comments
 
LVL 32

Expert Comment

by:nappy_d
ID: 40225815
Have you purchased any of the add-on subscriptions? Especially the IPS(Intrusion Prevention Service)

http://help.mysonicwall.com/sw/eng/305/ui2/23100/Security_Services/Intrusion_Prevention.htm
0
 
LVL 63

Accepted Solution

by:
btan earned 500 total points
ID: 40225837
looks like the source (64.15.124.211) is registered under youtube (and PTR @ cache.google.com), Sonicwall devices have a default action of dropping 'port scans' when detected. these are all high ports that should be denied by default.

However most of port scan are not attacks and are simple probes to determine services available on a remote machine. At times this log message "Possible port scan detected" appears in the case of false positives, which may occur if an application or user is legitimately connecting to several ports. This is just Detection, there would not be any drop for possible port scan detected, however Sonicwall will drop intensive Port Scan traffic.

If this is legit or expected then you can consider "disabling message "Possible port scan detected" in Logs" https://support.software.dell.com/sonicwall-e-class-nsa-series/kb/sw11594
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Occasionally, we encounter connectivity issues that appear to be isolated to cable internet service.  The issues we typically encountered were reset errors within Internet Explorer when accessing web sites or continually dropped or failing VPN conne…
Network traffic routing plays key role in your network, if you have single site with heavy browsing or multiple sites, replicating important application data from your Primary Default Gateway ,you have to route your other network traffic from your p…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question