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High CPU usage in some computer in our network

Posted on 2016-11-07
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Last Modified: 2016-11-27
in the past 1 week, i have been facing high CPU usage issue in some computers. When they connected to our network, their CPU usage get %100. Then i disconnect from the network and connect to other internet like 4G/LTE Hotspots, It gets normal like %0-1. I didn't get whats going on in my network. We have a Guest WiFi in our network. This WiFi works in different VLan. When I connect to that WiFi it gets normal too.

Please help me about this.
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Question by:Member_2_6551061
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by:John Hurst
John Hurst earned 166 total points (awarded by participants)
ID: 41878113
That would suggest to me that the computers are normal and that your Anti Virus is running a full scan and/or the Server is updating Windows.

Have you checked your Server for malware and viruses?
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by:Yogesh Patel
Yogesh Patel earned 167 total points (awarded by participants)
ID: 41878114
Looks clear problem of Malware which is sending too much request to your computer once you connect to your network. You can scan your system with  "Malwarebytes Anti-Rootkit"  and "Combofix" which free tools to scan for Malware.

Problem could not be in specific computer but whole bunch Network computers because when you are getting too much request it possibly from many computers.
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Bing CISM / CISSP earned 167 total points (awarded by participants)
ID: 41878218
what are the OS versions of the computers? how many of them are W10? if most of them are W10, below issue might be the case.

W10 now supports P2P update mechanism which allows you and your neighbours share the downloaded updates with each other, this could increase your broadband usage as well as network load.  however you have the option to disable it if you don't prefer this way.

FYI -

 http://www.pcworld.com/article/2955491/windows/how-to-stop-windows-10-from-using-your-pcs-bandwidth-to-update-strangers-systems.html
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by:Member_2_6551061
ID: 41879280
There is about 25 Windows 10 and others like 100 is windows 7. I faced this problem first in Win10 but now I have same problem some computers works in win 7 too
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by:John Hurst
ID: 41879293
If you are still sure that the ONLY time you get high CPU is with a connection to the Server and normal CPU when not connected (independent 4GL or Guest Wi-Fi) then consider:

1. Still a problem with your Server  OR
2. You have some legacy software on the machines (legacy Anti Virus) that is conflicting with the Server.
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by:John Hurst
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Question was properly answered
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Are your end users making ugly email signatures?

Have you left it up to your end users to create their own email signatures? Are they forgetting to add the company logo or using garish font colors? Take control and ensure all users have the same email signature.

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