1. Computer problem? Tech Support Guy is completely free -- paid for by advertisers and donations. Click here to join today! If you're new to Tech Support Guy, we highly recommend that you visit our Guide for New Members.

DNS lookup failed, windows 7, chrome

Discussion in 'Networking' started by gunnyfreak, Jan 3, 2013.

Thread Status:
Not open for further replies.
  1. gunnyfreak

    gunnyfreak Thread Starter

    Joined:
    Jan 3, 2013
    Messages:
    2
    as title says basically... this problem has been troubling me for 3 weeks now....

    a lot of the time the internet would just cut out and not work anymore, it still says connected and internet access but whenever I try to load stuff it says DNS lookup failed...

    over the 3 weeks I've tried many things, here is the list and results:

    ping 8.8.8.8: all packets lost
    scan for virus: all clear
    boot in safemode with networking: doesn't help
    changing dns servers: doesn't help
    using static and dynamic ip: neither helps
    running microsoft's fixit tool: doesn't help
    resetting IP/TCP: didn't help

    wired networking: stopped the problem for a few days, just when i think this could be permanent, the problem came back again...
    rebooting/resetting router: helps for a bit (i get connection back, for a few seconds at times to up to 20-ish minutes)

    any help would be appreciated

    thanks in advance

    gunny
     
  2. etaf

    etaf Moderator

    Joined:
    Oct 2, 2003
    Messages:
    65,252
    First Name:
    Wayne
    Is this the only PC that disconnects - do other devices connected work OK - if so how are they connected to the router - wireless or wired

    would you post the following tests when the internet is working OK, and then repeat ALL the tests when the internet disconnects.
    Make sure you also indicate on the reply which tests are for what condition.

    if you are connected by wireless, please include the xirrus screen shots for both conditions - see how below.

    Please post back here the make and exact model of the router and if you have a separate modem, the make and exact model of the modem.

    Please make a note of the status of the lights on the modem and on the router when working normally - post that light status here.
    Now when the internet disconnects make a note of the status of the lights for the modem and router here again. also note which have changed.

    What firewall / security suite or anti-virus do you currently have on the PC - or you have ever had on the PC in the past - any trial ware - like Norton, Mcafee , AVG , Webroot etc

    ------------------------------------------------------------------------
    ipconfig /all
    If you cannot access the internet with this PC, then you will need to paste the results into something like notepad and then copy onto a machine that can access the internet and post the results in a reply here.
    Save the file to a USB flash drive or other removable media. Plug it into the working computer with internet access and copy the file and paste here.

    We would like to see the results from an ipconfig /all - post back the results in a reply here.

    This should also work for windows 8
    Hold the Windows key and press R, then type CMD then press Enter to open a command prompt box
    (A new dialogue box - black with white font, will appear on screen ):

    In the command prompt window that opens, type the following command:

    Note that there is a space before the /ALL, but there is NOT a space after the / in the following command.

    ipconfig /all > network.txt & network.txt

    It will export the results into notepad and then automatically open the notepad and display on your screen.

    Now all you need to do is copy and paste those results into a reply here
    to do that:
    From the notepad menu - choose Edit - Select all
    all the text will now be highlighted
    Next
    From the notepad menu - choose Edit - Copy

    Now go back to the forum - goto the reply and then right click in the reply box and paste the results.
    The results from the notepad should now appear in the forum reply.
    ------------------------------------------------------------------------

    ------------------------------------------------------------------------
    Ping Tests
    If you cannot access the internet with this PC, then you will need to paste the results into something like notepad and then copy onto a machine that can access the internet and post the results in a reply here.
    Save the file to a USB flash drive or other removable media. Plug it into the working computer with internet access and copy the file and paste here.

    Start> Run {search bar in Vista/W7}> type CMD to open a command prompt box
    (A new dialogue box - black with white font, will appear on screen ):

    For Windows 8
    to open a Cmd Prompt or an Administrator Cmd prompt from the Desktop. Use Win + X and choose Command Prompt or Command Prompt (Admin) from the list.

    Type the following command
    Ping {then a space and then add the number that is shown against the item labelled "default gateway" shown in the results from the ipconfig /all}
    Post back the results in a reply here
    right click in the command prompt box
    select all
    enter
    control key + C key - to copy
    then reply here and
    control key + V to paste

    Type the following command
    Ping google.com
    Post back the results in a reply here
    right click in the command prompt box
    select all
    enter
    control key + C key - to copy
    then reply here and
    control key + V to paste

    Type the following command
    Ping 209.183.226.152
    Post back the results in a reply here
    right click in the command prompt box
    select all
    enter
    control key + C key - to copy
    then reply here and
    control key + V to paste

    ------------------------------------------------------------------------

    ------------------------------------------------------------------------
    Run Xirrus Wi-Fi Inspector
    Download and install

    If you cannot access the internet with this PC, then you will need to copy the program across to the faulty PC
    Save the file to a USB flash drive or other removable media. Plug it into the working computer with internet access and copy the file and install the program.
    You will now need to take a screen shot and copy that back to the working PC and attach the screen shot in a reply on the forum here.

    http://www.xirrus.com/Products/Wi-Fi-Inspector.aspx
    Direct link to the program is here http://info.xirrus.com/Wi-FiInspectorConfirmation.html

    {If the above link does not work heres another link http://www.pcworld.com/downloads/file_download/fid,77196-order,4/download.html}

    Then run and install the program - on a wireless enabled PC/Laptop
    if you get an error - You need will need to have NET Framework installed for the WiFi Inspector to function.
    On windows 8 - (i do not have windows 8) but, it would appear that, When you first try to run, you may get a message that .net framework is needed, and included in that message is a link to download/install.

    Run the program

    A user guide is available here http://www.xirrus.com/cdn/pdf/Xirrus-Wi-Fi-inspectorguide-1-2-1-RevB-6.aspx

    post a screen shot of the program running.
    if there are a lot of networks showing can you click on "networks" top lefthand area - so we can see all the network information.

    post which SSID name is yours, its located in the list, under network "Adapter Name" (1st column)

    To post a screen shot of the active window.
    1) hold the Alt key and press the PrtScn key. Open the Windows PAINT application (Start> All Programs> Accessories> Paint) and Paste the screen shot. You can then use PAINT to trim to suit, and save it as a JPG format file.
    OR
    2) if you are using Vista/Windows 7 you can use the "snipping tool" which is found in Start> All programs> Accessories> Snipping Tool

    To upload the screen shot to the forum, open the full reply window ("Go Advanced" button) and use the Manage Attachments button to upload it here.
    Full details are available here http://library.techguy.org/wiki/TSG_Posting_a_Screenshot

    Note:
    For a reliable (or robust as the Xirrus user guide says) wireless connection you need a signal of about -70 dBm or better. "A desirable signal level for a robust Wi-Fi connection will be green".
    note: the signal level is a negative number, so for example -88 is worst and -40 is better

    If you are using the Mac OS then use http://www.istumbler.net/

    if you want to optimise base station position and signal strength / dead spots use
    http://www.chimoosoft.com/products/apgrapher/ which has a graph function to monitor signal
    ------------------------------------------------------------------------
     
  3. gunnyfreak

    gunnyfreak Thread Starter

    Joined:
    Jan 3, 2013
    Messages:
    2
    phew, that's quite the post

    other devices work ok, they are wireless, this pc i tried both wired and wireless as par op


    when net is working:
    Code:
    Windows IP Configuration
    
       Host Name . . . . . . . . . . . . : [REDACTED]
       Primary Dns Suffix  . . . . . . . : 
       Node Type . . . . . . . . . . . . : Hybrid
       IP Routing Enabled. . . . . . . . : No
       WINS Proxy Enabled. . . . . . . . : No
    
    Ethernet adapter Local Area Connection:
    
       Connection-specific DNS Suffix  . : 
       Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
       Physical Address. . . . . . . . . : C8-60-00-C8-33-30
       DHCP Enabled. . . . . . . . . . . : Yes
       Autoconfiguration Enabled . . . . : Yes
       Link-local IPv6 Address . . . . . : fe80::1468:3142:436a:c8c%17(Preferred) 
       IPv4 Address. . . . . . . . . . . : 192.168.1.65(Preferred) 
       Subnet Mask . . . . . . . . . . . : 255.255.255.0
       Lease Obtained. . . . . . . . . . : Thursday, January 03, 2013 8:58:25 AM
       Lease Expires . . . . . . . . . . : Friday, January 04, 2013 8:58:25 AM
       Default Gateway . . . . . . . . . : 192.168.1.254
       DHCP Server . . . . . . . . . . . : 192.168.1.254
       DHCPv6 IAID . . . . . . . . . . . : 516448256
       DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-18-34-5C-1F-EC-17-2F-CF-A2-46
       DNS Servers . . . . . . . . . . . : 192.168.1.254
                                           75.153.176.9
       NetBIOS over Tcpip. . . . . . . . : Enabled
    
    Tunnel adapter isatap.{8E517D6B-32F4-40F7-8AC4-1B42E402806A}:
    
       Media State . . . . . . . . . . . : Media disconnected
       Connection-specific DNS Suffix  . : 
       Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4
       Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
       DHCP Enabled. . . . . . . . . . . : No
       Autoconfiguration Enabled . . . . : Yes
    
    Tunnel adapter Local Area Connection* 13:
    
       Connection-specific DNS Suffix  . : 
       Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
       Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
       DHCP Enabled. . . . . . . . . . . : No
       Autoconfiguration Enabled . . . . : Yes
       IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:342c:ffd:9353:f89a(Preferred) 
       Link-local IPv6 Address . . . . . : fe80::342c:ffd:9353:f89a%22(Preferred) 
       Default Gateway . . . . . . . . . : ::
       NetBIOS over Tcpip. . . . . . . . : Disabled
    
    
    
    
    Pinging google.com [173.194.33.0] with 32 bytes of data:
    Reply from 173.194.33.0: bytes=32 time=15ms TTL=55
    Reply from 173.194.33.0: bytes=32 time=11ms TTL=55
    Reply from 173.194.33.0: bytes=32 time=30ms TTL=55
    Reply from 173.194.33.0: bytes=32 time=16ms TTL=55
    
    Ping statistics for 173.194.33.0:
        Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
        Minimum = 11ms, Maximum = 30ms, Average = 18ms
    
    
    Pinging 209.183.226.152 with 32 bytes of data:
    Reply from 209.183.226.152: bytes=32 time=100ms TTL=49
    Reply from 209.183.226.152: bytes=32 time=90ms TTL=49
    Reply from 209.183.226.152: bytes=32 time=104ms TTL=49
    Reply from 209.183.226.152: bytes=32 time=107ms TTL=49
    
    Ping statistics for 209.183.226.152:
        Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
        Minimum = 90ms, Maximum = 107ms, Average = 100ms
    
    
    I'm not connected by wireless, though other devices are

    the modern is actiontec V1000H from telus

    the lights on currently are power, DSL, internet, one of the ethernet (the one to my pc) and wireless

    no firewall afaik, did have avast but uninstalled it and that didn't work

    will post tests when net offline when it comes offline

    thanks very much for the help :)

    Edit: on iPad right now, this time the iPad is still working but everything else (laptop cellphone ans main comp) disconnected

    here's the ipconfig /all

    Code:
    Windows IP Configuration
    
       Host Name . . . . . . . . . . . . : [REDACTED]
       Primary Dns Suffix  . . . . . . . : 
       Node Type . . . . . . . . . . . . : Hybrid
       IP Routing Enabled. . . . . . . . : No
       WINS Proxy Enabled. . . . . . . . : No
    
    Ethernet adapter Local Area Connection:
    
       Connection-specific DNS Suffix  . : 
       Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
       Physical Address. . . . . . . . . : C8-60-00-C8-33-30
       DHCP Enabled. . . . . . . . . . . : Yes
       Autoconfiguration Enabled . . . . : Yes
       Link-local IPv6 Address . . . . . : fe80::1468:3142:436a:c8c%17(Preferred) 
       IPv4 Address. . . . . . . . . . . : 192.168.1.65(Preferred) 
       Subnet Mask . . . . . . . . . . . : 255.255.255.0
       Lease Obtained. . . . . . . . . . : Thursday, January 03, 2013 10:58:10 AM
       Lease Expires . . . . . . . . . . : Friday, January 04, 2013 10:58:10 AM
       Default Gateway . . . . . . . . . : 192.168.1.254
       DHCP Server . . . . . . . . . . . : 192.168.1.254
       DHCPv6 IAID . . . . . . . . . . . : 516448256
       DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-18-34-5C-1F-EC-17-2F-CF-A2-46
       DNS Servers . . . . . . . . . . . : 192.168.1.254
                                           75.153.176.9
       NetBIOS over Tcpip. . . . . . . . : Enabled
    
    Tunnel adapter isatap.{8E517D6B-32F4-40F7-8AC4-1B42E402806A}:
    
       Media State . . . . . . . . . . . : Media disconnected
       Connection-specific DNS Suffix  . : 
       Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4
       Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
       DHCP Enabled. . . . . . . . . . . : No
       Autoconfiguration Enabled . . . . : Yes
    
    Tunnel adapter Local Area Connection* 13:
    
       Connection-specific DNS Suffix  . : 
       Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
       Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
       DHCP Enabled. . . . . . . . . . . : No
       Autoconfiguration Enabled . . . . : Yes
       IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:c72:22fa:9353:f89a(Preferred) 
       Link-local IPv6 Address . . . . . : fe80::c72:22fa:9353:f89a%22(Preferred) 
       Default Gateway . . . . . . . . . : ::
       NetBIOS over Tcpip. . . . . . . . : Disabled
    
    Ping default gateway timed out all 4times
    Ping google same thing
    Ping 209.183.226.152 initially got one reply but when I pinged again, nothing


    Edit 2:
    Funny thing... I tried connecting a second modern between the main pc and the ISP modern... Now nothing works when connecting to the second modern (ping to the second modern works fine but pinging the main ISP modern times out)

    The Ethernet cable is new so I don't think that would b a problem

    Seems like whatever device I use, it doesn't work after a few hours... I suspect sabotage as other people share the ISP with me so I checked qos, ip blocking and MAC address blocking, all of which came clear on the modern's GUI... Could sabotage be the case?
     
As Seen On
As Seen On...

Welcome to Tech Support Guy!

Are you looking for the solution to your computer problem? Join our site today to ask your question. This site is completely free -- paid for by advertisers and donations.

If you're not already familiar with forums, watch our Welcome Guide to get started.

Join over 733,556 other people just like you!

Loading...
Thread Status:
Not open for further replies.

Short URL to this thread: https://techguy.org/1083510

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice