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Random DNS errors


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#1 Rlad78

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Posted 11 May 2010 - 05:24 PM

So I have about 7 computers in this house (not all mine of course) and for some reason, only one of my computers has this problem.

This computer is running Windows 7 and connected through an Ethernet cable to an AT&T 2WIRE 2701HG-B Gateway Modem. Every once in a while, probably every three days, this computer's internet just stops working. Connection to the modem is fine, but there's no connection to the internet. When I try to automatically resolve the problem, Windows says something like "Cannot contatct DNS address" (not sure this is entirely correct). None of the laptops that are connected to the 2WIRE have this problem, and I have another computer (Win XP) that is also connected to it through an Ethernet cable that does not have this problem. I know it's not Windows 7 because this has only started happening in the past 3 months.

It usually happens when I'm surfing the web. I'll most of the time get a "page cannot be loaded" error, but if I reload the page it works. There's also been instances where the page does not load fully, just displays the basic page layout. The main problem though is when it shuts off completely. It's never off when I come home, but during browsing the web or after I have gotten off the internet and tried to get back on it just cuts off.

I've tried reseting my TCP/IP, made sure that my DNS server address is obtained automatically, made sure nothing is blocking the connection on the router's end, and used one of Microsoft's Fix It programs, but nothing has seemed to work. The only way I can seem to get my internet back, since Windows 7 can't fix it automatically, is to restart the computer and it's beginning to be a real pain in the :thumbsup: if ya know what I mean.

Anyone have any ideas how to fix this? Any help would be appreciated.

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#2 Broni

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Posted 11 May 2010 - 05:43 PM

What browser do you use?
Did you try different browser?
When browser stops working, did you try "ping" command to see, if connection is still there?

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#3 Rlad78

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Posted 11 May 2010 - 06:08 PM

What browser do you use?
Did you try different browser?
When browser stops working, did you try "ping" command to see, if connection is still there?

Use Google Chrome and Firefox, Chrome for quick browsing and Firefox for longer use. Both have the same problem and so does IE. The caution symbol appears on the network status, so I don't think my browser is the problem.

Haven't tried the ping command, but I'm pretty sure the connection is lost since Windows tells me so.

#4 Broni

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Posted 11 May 2010 - 07:14 PM

Did you try to reinstall network adapter driver?

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#5 Rlad78

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Posted 11 May 2010 - 08:53 PM

Just did. Same problems still occur.

#6 Broni

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Posted 11 May 2010 - 09:27 PM

Try some basic steps....


Make sure, your computer is set to obtain IP address automatically.
1. Go Start>Settings>Control Panel (Vista/7 users: Start>Control Panel)
2. Double click Network Connections (Vista/7 users: Network and Sharing Center)
3. Vista/7 users - From the list of tasks on the left, click Manage network connections.
4. For a wired network connection, right-click Local Area Connection, and then select Properties.
For a wireless network connection, right-click Wireless Network Connection, and then select Properties.
5. From the General tab (Vista/7 users: Networking tab), click Internet Protocol (TCP/IP), make sure it is checked, and then click Properties
6. Click Obtain an IP Address Automatically, and then click OK.

If that doesn't work...
Turn off computer. Disconnect router, and modem from power source for 1 minute. At the same time disconnect ethernet cable as well.
Reconnect everything.
Restart computer.

If that doesn't work, bypass router, and connect computer straight to the modem.

If that doesn't work...
Go Start>Run (Start search in Vista), type in:
cmd
Click OK (in Vista, while holding CTRL, and SHIFT, press Enter).

In Command Prompt window, type in following commands, and hit Enter after each one:
ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renew
net stop "dns client"
net start "dns client"


Restart computer.

If that doesn't work...
Go Start>Run (Start search in Vista), type in:
cmd
Click OK (in Vista, while holding CTRL, and SHIFT, press Enter).

At Command Prompt, type in:
netsh int ip reset reset.log
Hit Enter.
Type in:
netsh winsock reset catalog
Hit Enter.

Restart computer.


If that doesn't work...
Download, install, and run WinSockFix: http://www.softpedia.com/get/Tweak/Network...inSockFix.shtml (doesn't work in Vista)
Restart computer, and check again.

If that doesn't work...
Download Dial-A-Fix (DAF) (doesn't work in Vista):
http://wiki.lunarsoft.net/wiki/Dial-a-fix#...2C_and_articles

Have XP CD available in case DAF needs a file. Likely not!

Check all boxes on the screen (clear any restrictions if it shows any)
Then click GO!

When the entire page is finished click the HammerHead at bottom to go to the second DAF page.

Here, one at a time, do the below:

Reinstall BITS
Reinstall Windows Firewall
Repair Permissions
Reset networking

Watch for any File not found or other errors and make note as this may lead to the fix!

Restart computer.

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