Why do I see a DNS failure when running Torrent software and using the WiFi?

sachin June 29, 2011

Whenever I start any Torrent software, I can not access WiFi internet, all web sites show DNS failure. But when I stop Torrent & reconnect, it is working.

Ibelieve this problem started when I was defragmenting with Defragler, µTorrent was running, afterwards these strange things started.

Please help!

  1. Jay
    July 6, 2011 at 5:25 am

    If everything fails...use system restore and go back in the days when everything was alright !just choose a checkpoint when strange things were not happening ! 

    • Bes Zain
      July 6, 2011 at 5:28 am

      I strongly recommend against using a system restore. There is nothing wrong with the computer or the system. Windows is just choking out the WiFi because of the data upload and download bursts. System Restore will not solve the problem.

      Defraggler does nothing to connection settings or WiFi in Windows. It only focuses on the hard drive data files and sectors.

      • Jay
        July 6, 2011 at 5:43 am

        he is using the same software from last 5 years....unless his wifi has become poor...torrent cant affect the browsing like this...and when it does, it uses the bandwidth...browsing gets slower but doesnt get stopped...if one has not installed any important softwares or made changes in the system settings...the system restore doesnt harm...

        • Bes Zain
          July 6, 2011 at 6:01 am

          System restore is not the solution. System Restore removes all the major changes and updates to your computer, files or software to the last system restore save point. Losing all of those changes is a big harm when the solution is something else.

          It is a well known fact online for years that on many computers, due to router or Windows configuration, uTorrent and other torrent downloads will kill the wifi connection. Here is one official uTorrent thread talking about the exact issue:


          Torrent does affect the browsing exactly the way he/she mentioned. I know it is hard to accept the fact that you may be wrong, specially online, but please avoid recommending system restore or drastic changes as solutions unless you're absolutely sure what is going on or that it is the solution. You'll end up giving him/her more headache than what is warranted.

          The only solution is to get a new router, wifi card or change the Windows or uTorrent download/upload speed settings. System Restore is not recommended in this case as nothing has been damaged on his computer, which is what System Restore is designed to fix.

  2. Bes Zain
    July 6, 2011 at 5:17 am

    It is uTorrent, and not Defraggler. Everything on your computer is fine; uTorrent is simply pumping out data and downloading at a burst [limit or intensity] that is making your WiFi connection [either due to your wifi card, firewall or router but not all] reach its downloading limit.

    1 : Simply go into uTorrent and change the download speeds or max # of connections to something lower, maybe half or 3rd of what it is. Then try again. Use the uTorrent wizard if you have to and choose one of the slower connection settings.

    2 : By the way, going into the Task Manager and shutting down [by force] any other processes that you know use the internet [never, ever shut down Explorer or your firewall like that] also helps. It's basically like a tube. The wifi internet tube is getting clogged up with too much data being sent in and out. You need to make uTorrent upload/download a bit slower OR remove other things being uploaded/downloaded.

    I recommend # 1 - that is the safest solution.

  3. Mike
    June 29, 2011 at 5:02 pm

    Torrent is very intense on your internet connection and your networking hardware.
    For Torrent it is very common to maintain over +2000 connections while most (cheap) home networking equipment is limited at 2000 or less.

    The situation you describe is therefor quite easy:
    a) Torrent takes way to much bandwidth > lower maximum speeds (both up&download)
    b) Torrent maintains too much connections > lower peer/connection count

  4. Gustavo Ibarguengoytia
    June 29, 2011 at 4:48 pm

    There is that possibility or maybe you have configured uTorrent in someway that interferes with the rest of your applications. Have you changed the ports, DNS configuration or anything of that sort in uTorrent? What about your modem/router have you opened up any ports?

    • Svbothare
      June 29, 2011 at 5:09 pm

      no i did not chang anything, i was running defrag & mutorrent together
      after some time i was unable browse internet. so i closed mutorrent , & restarted pc, i was back again to internet. the momment i start any torrent program i lose my wifi connectivity.

      i was using torrent for more than 5 years, but did not face anything like this. os is window vista 

      • Gustavo Ibarguengoytia
        June 29, 2011 at 7:41 pm

        Can you use an ethernet cable to connect to your modem/router, so you can test if that problem is specific to the wifi connection?

        Do you have automatic DNS lookup or did you set up your self?

        Did you do a backup of your registry before cleaning it? Try restoring that registry and check your torrent performance and internet connection, did it get fixed?

        • Svbothare
          June 30, 2011 at 5:58 am

          i did not do backup of registry , i normally use ccleaner for cleaning my pc.
          i could not check with lan cable , only wifi connectivity is given considering bigcampus.

          i normally connect to net automatically without any setting

        • Gustavo Ibarguengoytia
          July 1, 2011 at 1:32 pm

          Have you tried removing uTorrent and reinstalling it?

          I am not that very knowledgeable on networks but I can only think of two issues:
          1.- Your internal registry is messed up which should be fix by removing and reinstalling uTorrent.
          2.- If you are in campus it is possible that they limited the amount of connections each IP/computer can handle.

          Try installing a VPN or getting a specific DNS address.
          This website has a list of DNS servers you could use, try the one nearest to your location, and some other guides on opening ports and solving networking issues: http://portforward.com/networking/dns.htm

        • Jay
          July 6, 2011 at 5:46 am

          reinstall torrent software....or restore the system...check if anything wring with wifi...ask fellow users who are uding torrents..if they  have the same problem...

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