Failing Internet connection / DNS

September 24, 2010 at 10:44:46
Specs: Windows XP
We have a window xp machine that continues to intermittently drop it's internet connection. Usually /flushdns will resolve the issue for about 15 minutes then it is needed again. Note that when it loses it's internet connection it's local connection is still working fine and other devices using the same internet connection continue to work fine.

Any help with this is appreciated.

Thank you.

See More: Failing Internet connection / DNS

Report •

September 24, 2010 at 10:54:29
lets start with a post of an ipconfig /all

Report •

September 24, 2010 at 12:08:06
I don't think I should for security reasons. But all of the information provided from and ipconfig /all is the same as other devices working fine except the ip address of course.

Report •

September 24, 2010 at 12:53:01
Well, ipconfig provides no specific security concerns. Unless you're binding an external IP address to that specific computer and not using a firewall.

This is like a TCP/IP issue - Without knowing more detail it's difficult to tell specifically (when it drops Internet, can you still ping out by IP - that indicates it's just a DNS issue, etc.)

A lot of time simple troubleshooting will fix these issues, disable/re-enable the network adapter.
But as long as you're running at least XP SP2, you should just force a winsock reset and reinstall TCP/IP by running:
"netsh winsock reset"
from a Command Prompt. (Without the quotes).

Good luck.

Report •

Related Solutions

September 24, 2010 at 13:15:42
I cannot ping an outside source when the issue is occuring. A winsock reset didn't manage to fix anything.

Not sure if it has anything to do with the problem but the specific machine also has a CD burner/printer attached to it via Firewire card.

Edit: So far I have reset winsock, changed the dns servers ,and disabled the firewire connection. Probably more than that but that is what comes to mind.

Report •

September 24, 2010 at 14:06:32
If there was a security issue I wouldn't have asked for the information without telling you what to blank out.

You provide no data so everything you say doesn't help.

Let us know when you want to provide the data requested so we can help you troubleshoot this issue.

Presently you are using the shotgun approach which may dig you a deeper hole.

Report •

September 24, 2010 at 14:32:23
Window IP Config
Host Name: PCNAME
Primary DNS Suffix: Domain 2
Node Type: Unknown
IP Routing: No
WINS Proxy Enabled: No
DNS Suffix Search List: Domain 2
Domain 1

Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix: domain 1
Description: Marvell Yukon 88E805 PCI-E Gigabit Ethernet Controller
DNS Servers:

Report •

September 24, 2010 at 15:42:56
What is at .25 and .26? Internal dns servers?
what is with domain 1 and domain 2? Usually domain suffix notation is in the form domainname.extension like or

Report •

September 27, 2010 at 05:59:31
Yes .25 and .26 are internal dns servers. domain1 is .com and is the primary and domain2 is internal and .local.

Report •

September 27, 2010 at 07:52:24
both dns servers have their forwarders configured to have the internet providers dns entries?

This doesn't look right to me

Primary DNS Suffix: Domain 2
DNS Suffix Search List: Domain 2
Domain 1
Connection-specific DNS Suffix: domain 1

I would suggest you only use one or the other by not both and not having one be primary and another be connection specific.

Report •

September 27, 2010 at 08:00:08
Both servers have the forwarders yes. The specific was added after the issue started occuring and made no change.

Testing now with only one domain suffix and no connection specific.

Report •

September 27, 2010 at 12:33:02
I am still getting the same results. The internet connection fails intermittently but the LAN connection never drops.

Report •

September 27, 2010 at 13:33:50

Please post a tracert to
xxx out your wan ip address

Also post the contents of the dns forwarders. This is public info so no risk there.

Review the dns error logs on the servers for any failures. This may give us a clue.

Report •

September 30, 2010 at 06:30:37
Thank you both very much for you help. It seams the problem is with our ISP specifically with the DSL modem we have here. The problem seemed isolated to the one machine because it was the most noticeable failure. I have since noticed other machine that do not completely time out but will open blank pages.

Again thank you very much.

Report •

Ask Question