Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Some PC's on a Windows server 2003 domain keep dropping their internet connection

Posted on 2010-08-23
5
Medium Priority
?
306 Views
Last Modified: 2012-05-10
For the last 3 weeks, about 10 workstations on this main subnet (90 connections) of a Windows 2003 single  domain  randomly drop their Internet connection sometimes a few times a day.  Consistently, running  'ipconfig /flushdns and ipconfig /registerdns fixes the issue, but only temporarily.  Then the problem comes back.  When the machine has this problem, internet addresses can be pinged, but not browsed to, even if the address is put into the browser.  The age of the machines does not seem to matter.  Simply rebooting sometimes fixes the problem, but sometimes does not.  DCdiag DNS tests on the 2 DCs are clean.  Access to internal resources is OK, except, randomly, to Live communicator.  I also noticed that a couple of people are intermittently unable to access Live Communicator, even when they CAN get to the Internet.   Most people are completely unaffected. This is a new problem, and happens to the same machines.   I have taken machines off the domain and re-added them, to see if that fixes the issue permanently. I will know if that worked tomorrow.  There is no common thread in the local event logs. The server logs are clean of events that would affect this.  I am not sure where to look next,  any assistance would be appreciated.  I can post whatever you think would help.
0
Comment
Question by:quaybj
  • 3
5 Comments
 
LVL 3

Expert Comment

by:petelettin
ID: 33505819
Do you use a proxy server?

When a FQDN is pinged the address is resolved by the local machine.
If you use a proxy the address is resolved by the proxy server.

0
 

Author Comment

by:quaybj
ID: 33508667
Thanks petelettin,
We are not using a proxy server.
0
 

Author Comment

by:quaybj
ID: 33508675
correction to the description: Internet addresses CANNOT be pinged consistently when this problem occurs.
0
 
LVL 2

Accepted Solution

by:
pmanno earned 2000 total points
ID: 33524470
Have you looked at the output of ipconfig /all and route print on the client machine during the connection drop?  Does the ipconfig change?  Does the client lose the default gateway?  Can clients ping and resolve local network devices?  What OS are the clients running?  I've found that some Vista machines randomly drop the routing table entry for the default gateway.
0
 

Author Comment

by:quaybj
ID: 33528432
Thanks pmammo.
I rebooted all the switches and the problem went away.  I am not convinced the real solution has been found.   I will take your suggestions to investigate routing under advisement for next time (and I'll bet there will be a next time).  Usually when the switches need to be flushed, no one can connect to the Internet, so I was looking for a different problem since the issue was not widespread.  
We are not running any Vista clients, only XP.  Clients could continue to ping and resolve local network devices;  ipconifg /all showed they were pinging the gateway.  They could not use Live Communicator, though Exchange kept working.  A mixed bag of symptoms.
I am awarding you some of the points because your suggestions make sense.
Thank you for your comments.
0

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This is the first one of a series of articles I’ll be writing to address technical issues that are always referred to as network problems. The network boundaries have changed, therefore having an understanding of how each piece in the network  puzzl…
This article offers some helpful and general tips for safe browsing and online shopping. It offers simple and manageable procedures that help to ensure the safety of one's personal information and the security of any devices.
This video shows how to quickly and easily deploy an email signature for all users in Office 365 and prevent it from being added to replies and forwards. (the resulting signature is applied on the server level in Exchange Online) The email signat…
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…

783 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question