DNS lookup failed, windows 7, chrome

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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
 

etaf

Wayne
Moderator
Joined
Oct 2, 2003
Messages
65,456
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
For your information only
these tests will check various stages of the connection, the first ping test, ping default gateway checks to see if you still have a connection to the router.
The next two Ping google.com & Ping 209.183.226.152 tests the connection to internet. google is to test by name and the ping test using a number is checking that a connection exists without DNS.
these tests then confirm if there is a dns issue on the connection.

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

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

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?
 
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