Internet working slow some times

I am using sonicwall 1260 firewall in my network which is having around 50 users.
some times my internet works  very slow same time i am  getting log report in sonicwall like
09:49.4      Probable port scan dropped      209.85.227.147, 80, WAN      192.168.168.133, 1170, LAN      TCP scanned port list, 1161, 1160, 1163, 1162, 1165, 1164, 1166, 1167, 1168, 1169
      
11      10      09:49.4      Possible port scan dropped      209.85.227.147, 80, WAN      192.168.168.133, 1164, LAN      TCP scanned port list, 1161, 1160, 1163, 1162, 1165

somebody can help me in this issue
we4uAsked:
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ChristophermageeCommented:
Well i would be looking towards your users more than outside influences.  However you can check where its coming from by going to www.checkdomain.com. The IP you have there is actually Googles.

Hopefully uour sonicwall has the same features as ours.
Goto log then reports and check the Bandwidth by IP address to see if someone is downloading like crazy.   You can reset the counter if it helps.  

Hope this helps
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we4uAuthor Commented:
why in sonicwall showing packet dropped and the same time inter net works slow...
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ChristophermageeCommented:
Well dropping a port scan from google isnt exactly a big thing. If your log is filling up with 100's and 1000's of these in a short period of time and not from a company like google then start to worry about it. However if its one or two here and there I wouldnt especially if its from a company like google which constantly scans the net. Also if someone external to you is port scanning there is pretty much nothing you can do about it except make sure your firewall has a good policy on it. Also the amount of data one dropped packet creates isnt enough to slow your net it would need to be thousands in a short period.

As for why just a coincidence. If you look through your logs you will probably see those odd dropped packets since you bought the unit.

Check the logs for bandwidth useage I am sure you will find someone or a few users who is downloading like crazy or perhaps they have a virus.

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we4uAuthor Commented:
ok
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