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The internet connection speed in our LAN has been slow down for several days.

  • Is it possible that a virus is the cause of that?
  • How can I detect the cause of this low speed?

EDIT :

I closed all apps and I run from command prompt : netstat -b -v and the output is :

Connexions actives

  Proto  Adresse locale         Adresse distante          Etat
  TCP    Ambre-28:1118          toolbar.iad.ask.com:http  CLOSE_WAIT      188
  C:\WINDOWS\system32\ws2_32.dll
  C:\WINDOWS\system32\WININET.dll
  [Updater.exe]


C:\Documents and Settings\Ambre-28>

So there is an unexpected connection opened by the toolbar.iad.ask.com. How to kill this connection ?

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what have you did to LAN recently ? –  hamed Mar 14 '12 at 11:16
    
What does the network administrator say happen "on the wire"? –  Thorbjørn Ravn Andersen Mar 14 '12 at 13:28
    
He didn't know what's happening ! –  Andy Frédéric ANDRIANIAINA Mar 14 '12 at 13:47
    
Somebody installed the ASK.com Toolbar so uninstall it. Can you just wipe the computer in question? Of course Ask.com is not malware its just annoying. –  Ramhound Mar 14 '12 at 17:46
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1 Answer

If a virus is opening network connections it may reduce the available speed for you.

You can do a basic check by running "netstat" and see if any unexpected connections are open.

share|improve this answer
    
What are the options to use in that case ? –  Andy Frédéric ANDRIANIAINA Mar 14 '12 at 11:12
    
i assume you are using windows. close your browsers,chat clients, game etc (all apps that you know use network) . Then run netstat on command prompt . Ideally there should be no connections opened from your PC. –  daya Mar 14 '12 at 11:14
    
I displayed the output of the netstat command in my question, see my edit. –  Andy Frédéric ANDRIANIAINA Mar 14 '12 at 11:31
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