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MSTask.exe = 100% CPU?

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Name: Steve Caban
Date: November 1, 2001 at 18:26:49 Pacific
Comment:

In my system processes it tells me 100% cpu power is being used and 99% of it is in MSTask.exe! I cannot end the process, this problem happened a week ago then it went away for awhile but now its back and I think its a virus. Please there has to be a fix! This thing is annoying and it slows my system to a crawl unexpectedly.



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Response Number 1
Name: Brian
Date: November 2, 2001 at 05:47:49 Pacific
Reply:

Greets,

Just an Idea... Services originate from the services and Applications. Maybe check and see if there is a service that doesn't look fimillar. Try stopping through services should work. I've never been able to get services to stop though task manager either.

Hope this helps

Brian


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Response Number 2
Name: kush
Date: November 2, 2001 at 13:21:05 Pacific
Reply:

I had the same problem last night.I also thought maybe a virus.I installed service pack 2 for win2k.Its working ok for now.I'm in the process of downloading port scanning software just to check any intrusion.


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Response Number 3
Name: Steve Caban
Date: November 2, 2001 at 13:54:44 Pacific
Reply:

Maybe I should just get the service packs and other updates and see if that helps. There seems to be no service for this problem since the problem exists in mstask and that is what is being used when i hit ctrl alt del. So I dunno.


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Response Number 4
Name: Steve
Date: November 8, 2001 at 02:42:35 Pacific
Reply:

I also see this sometimes. Only fix is a reboot. I'm running win2k SP2.
I found reference to a Denial of Service "virus" for mstask on NT4. I wonder if it's the same thing?
Sometimes I've also seen 99% cpu for LexBceS.exe service, which I think may be a print driver for my Lexmark printer?


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Response Number 5
Name: Maggie
Date: December 3, 2001 at 06:07:59 Pacific
Reply:

I've been getting the same problem. (mstask.exe causint 100% cpu usage). I've also been getting high cpu usage for my Hewlett Packard printer .exe as well. I have the updates and service packs installed but the problem keeps coming up. Has anyone found a solution?


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Response Number 6
Name: Janbu
Date: December 5, 2001 at 12:20:32 Pacific
Reply:

I also have the same problem, with Windows 2000 service pack 2. I installed Service pack 2 just recently, and have had some problems since. When looking into it, I discovered that mstask.exe was using almost all resources. I don't have a solution, but would very much appreciate it if anyone knows how to fix it!!


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Response Number 7
Name: Tal Dayan
Date: December 5, 2001 at 13:55:51 Pacific
Reply:

We just had the same problem (Windows NT 4.0 SP 6) after running port scanner against 'localhost'. Looks like mstask.exe listens on a local port and can 'get confused' by conncting to it.

=====

Windows NT 4.0 is vulnerable to a denial of service attack, due to a vulnerability in the Microsoft Task Scheduler (MSTask.exe). An attacker can send random characters to port 1026, where MSTask.exe listens, to consume 100% of the CPU resources and cause the system to freeze. The system must be restarted to regain normal functionality.


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Response Number 8
Name: Janbu
Date: December 6, 2001 at 05:39:23 Pacific
Reply:

In my case, restarting the machine does not help. Just after restart, MSTask.exe is using 100% Cpu again.


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Response Number 9
Name: Walter Posch
Date: December 9, 2001 at 10:41:41 Pacific
Reply:

I found a handy little program at http://www.iarsn.com/ that solved the above mentioned problem. (Taskinfo 2001)


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Response Number 10
Name: Kernal32
Date: December 11, 2001 at 15:02:07 Pacific
Reply:

If running a NT platform, your more vulnerable but can affect other OS platforms as well. Read the note at this sight to explain your problem. http://www.securiteam.com/windowsntfocus/6A00B150LY.html


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Response Number 11
Name: Dana Turner
Date: December 11, 2001 at 19:10:42 Pacific
Reply:

As a previous response stated Iarsn Taskinfo 2000 (http://www.iarsn.com/) Does allow you to kill the offending MSTASK Thread.... Running NETSTAT -AN shows nothing either...


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Response Number 12
Name: Thomas Martin
Date: December 13, 2001 at 08:43:55 Pacific
Reply:

I had the same problem. I disabled the "task schuduler" service. This works provided you don't need the service. Now mstask.exe doesn't run.


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Response Number 13
Name: Torbjörn
Date: December 20, 2001 at 08:56:51 Pacific
Reply:

I'm experiencing this as well. Currently mstask.exe hogs half of my cpu time, and my lexmark printer the rest (lexpps.exe) (although neither process should have anything do do). Very annoying!


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Response Number 14
Name: PM
Date: December 21, 2001 at 06:03:56 Pacific
Reply:

This has happened to several of our W2K workstations. Only aid is re-install or disabling the Task scheduling service. I recommend the latter, as this is rarely used on workstations.

So, from Services, stop Task scheduler, then set it to startup manually.


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Response Number 15
Name: chi
Date: December 28, 2001 at 09:13:15 Pacific
Reply:

I've installed service pack 2 for win2k. It didn't work for me. PC still freezes up and showing 100% used up on CPU. Someone mentioned that disable the Task Scheduling Service can help to solve the problem.

Can someone please tell me how to disable this Task Scheduling or any other solution to this problem. Thanks.


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Response Number 16
Name: larry Schultz
Date: January 7, 2002 at 16:04:10 Pacific
Reply:

using Administrator tools, go to services, half way down the list you will find a task called task scheduler. Right click, and go to properties. Change the start-up from automatic to manual. Unless you are running server, or specificlly using this task, this should not be an issue for your system. Apply the change and exit.

when you reboot, the problem will not come back. If you can't reboot for what ever reason, then get Pstools from http://www.sysinternals.com
and use pskill and the task number from the task manager window. The problem will terminate.

If someone figures out what is causing this, please let us know, and let Microsoft know so they will fix it!

LDS


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