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This constantly started to happen some time ago. I connect to my router andand lose every few seconds connection to router and it reconnects again. I have screenshooted most errors that Event Viewer reported. First comes overview:

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And now 3 events that happened at the same time:

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As you noticed, all 3 came at same time, when first was warning saying something about semaphore timeout, second was about losing lease and last was about NAT.

After several minutes of this happening, i could not connect to router as NIC showed that it was aquiring address and just repeated connection attempts until i just had to cancel connection. You can see this in Event Viewer:

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This problem happens with other hotspots as well.

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This could be caused by a few things, but looks to be specific to your NIC.

Try these steps:

  • Upgrade the NIC drivers
  • Try and get alternate drivers working (uninstall custom drivers and see what windows comes up with via windows update, or install vendor specific drivers)
  • Boot to Ubuntu via a live CD, and see if you experience the issues under a different OS.
  • See if any high network traffic applications are consistently running when this happens.
  • Wireless Zero Configuration might be interfering, disable the service.
  • Disable any 3rd party firewall software you may have running (or other related security software) to see if the issue solves itself.
  • Try clearing the ARP cache when renewal fails (See Method 4)
    • netsh interface ip delete arpcache

As an additional debugging step to ensure it was NIC related would be to use another external wireless adapter (like a USB based NIC) to see if it would also experience the same problems under your OS.

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That's pretty logical solution you advice here Sara. Do you know if it is possible to boot to Ubuntu directly from CD or other external media? Thanks. – Boris_yo Feb 18 '12 at 16:36
Yes booting can be achieved easily via CD/DVD, or if your motherboard supports it you can do it via a correctly configured USB. – Sara Gamage Feb 18 '12 at 22:50
Should i burn it on CD-R or CD-RW media? I know it gets updated often and hence this question. – Boris_yo Feb 19 '12 at 10:56
CD-R is fine, they're very cheap, and the time that'll pass between needing to burn the next version will be a while. – Sara Gamage Mar 13 '12 at 8:04

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