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think friends computer has a dos


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#1
daspien

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Hi ive been helping a friend trouble shoot their computer
and i have good knowledge / understanding of computers currently working on getting my a+

but today my friend lost internet on their main computer
they plug straight into the modem have done some testing
and isolated the computer as the problem as when pluging in the laptop into the modem
it has internet connectivity have ran malwarebytes on the system in question and it didnt find anything then decided to try a system restore which worked
the computer had internet again but for all of 10mins which makes me wonder if they have a dos virus / attack going on

have done ip flushes and renews also to no avail

any ideas of what else it could be or how to get rid of it , know the easy route is a format but they have alota data they dont want to lose

oh and when i say internet i dont mean just webpages but msn, ventrilo and WoW also have no connectivity and the connection says limited or no connectivity
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#2
Neil Jones

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Have you contacted the internet provider?
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#3
daspien

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yea and the modem works fine tested all that by connecting a laptop on the modem
and internet works fine on the laptop is only the computer thats having the issue
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#4
rshaffer61

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Laptop or desktop?

they plug straight into the modem have done some testing
and isolated the computer as the problem as when pluging in the laptop into the modem

Are you saying you have tried both a desktop and laptop with the same results?
Are you hardwiring to the modem?
Have you tried a different line to connect with?

which makes me wonder if they have a dos virus / attack going on

If you truly believe this to be the problem then I suggest you go to the Malware Removal and Spyware Removal Forum and run all the steps located in the
START HERE. These self-help tools will help you clean up 70% of problems on your own.
If you are still having problems after doing the steps, then please post the reguested logs in THAT forum.
If you are unable to run any of the tools then start a new topic in the malware forum and put this in the subject line...I am unable to run any malware tools

If you are still having problems after being given a clean bill of health from the malware expert, then please return to THIS thread and we will pursue other options to help you solve your current problem(s).

Add a link to this topic so that malware tech can see what steps have been taken here
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#5
dsenette

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the computer had internet again but for all of 10mins which makes me wonder if they have a dos virus / attack going on

Virus maybe, DoS not likely.

a DoS (Denial of Service) attack is done by targeting the public IP of a system, which would ultimately be the IP address of the modem not the desktop (unless the desktop is set up in such a way that it NATs out to a static private IP, and nothing else that connects to the modem does, though that's unlikely to be the case without a router or firewall in the mix). if there was a persistent DoS attack going on that was targeting the modem's public IP, then anything you plugged in would have the same issue since a DoS would be completely flooding the connection.
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