Solved Network and internet interruption .

March 9, 2013 at 12:56:43
Specs: Windows 2003 SP2
Loosing connection to router and server.

Disconnecting the server from the network, will solve the problem. reconnecting the server to the network , will lead to network and internet interruption...(time for problem occurence is unkown) no major errors , were found inside the event viewer in windows 2003 SP2.
Problem was found, after 3 days troubleshooting the network infrastructure.all seems working properly.

I have 10 workstations(win XP) and HP server with windows 2003 SP2. DHCP on server is enabled and DNS as well. even tried to disable DHCP from the server, and enable it on the router, but the same problem occured again, after 2 hours from connecting the server to the Network.
The problem is very easy to observe it, but difficult to find the solution..... I opened two PING sessions, one from my worksation to the server and the second from my workstation to router. the problem in fact,is starting buy slowing down the pakets transferred from 1ms to 15ms, 27ms,and more, then a request time out message will occur in both PING sessions(in the same time, I am encounterring Network and internet interruption), unplugging the server from the Network, will lead to solve the problem, after minutes of the outage, and everything will comeback normal.

I hope that someone has faced this confusing problem on windows 2003 SP2.

NB: Firewalls, antivirus, were disabled for troubleshooting purpose, and also didn't solve the problem.


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✔ Best Answer
April 12, 2013 at 07:25:45
Further to previous problem , here to inform everyone in this conversation forum ,that finally I solved the problem.........

It was very long days and nights troubleshooting and analizing.

The NIC is ok and all hardwares are ok....... The main problem was in the Domain controller and also windows 2003 .

After formatting and reinstalling the Windows 2003 server and creating new DC . all network problems were completely solved and Network and internet never disconnected or interrupted again.....

Sure it's very hard to face such problem, since you need to re-infrastrucuture all the network and client computers, as well......

But at least very satisfied, to catch and solve finally the problem......




#1
March 9, 2013 at 17:48:24
Off the top of my head, the network card in the server could be failing or a pinched cable. It may not be software related.

How do you know when a politician is lying? His mouth is moving.


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#2
March 11, 2013 at 08:30:00
I agree with guapo, the first thing you should do is troubleshoot the NIC on the server. That's simple enough to do and pretty quick too. Put a new NIC in, disable (if it's onboard) or remove (if it's a card) the one you've been using and see what happens. If the problem doesn't reoccur, you've solved the issue.

If however, that doesn't fix the issue, the next thing I would do is install wireshark on your server. I would then start a packet capture and would connect the server to the network. Let it run until the problem occurs and then check through the packets to see what information they offer with regard to what's going on.

- Is this server a Domain Controller?
- Is the server's IP address static (it should be)?
- What type of router are you using (make/model)?
- What type of switch are you using (is it managed layer 2/3 or just a "dumb" switch)?

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#3
March 11, 2013 at 13:39:26
- Yes this server is a Domain controller.
- The server has a static ip.
- The router is Thomson TG587n
- I am using Lightwave 24 port switch ( I have bypassed the switch by connecting my desktop pc and the server direct to the router Ethernet port, also the problem reoccurred).

I will first install wireshark on the server and check the packets,maybe I will save changing the Network card....

Your help and continuous support is really appreciated.


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#4
March 12, 2013 at 07:25:11
Thanks for the info.

From what I'm seeing, everything is still pointing at the NIC as being the problem. I know it's a pain in the butt to do hardware on a production server but if you do it outside of regular business hours, that should be the least disruptive time to do it.

I wouldn't bother with wireshare at this point in time. I would buy a NIC and replace it. If the problem is the NIC, you risk having it cause some real issues (like a major broadcast storm) which could adversely affect the entire network, not just the server.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#5
April 12, 2013 at 07:25:45
✔ Best Answer
Further to previous problem , here to inform everyone in this conversation forum ,that finally I solved the problem.........

It was very long days and nights troubleshooting and analizing.

The NIC is ok and all hardwares are ok....... The main problem was in the Domain controller and also windows 2003 .

After formatting and reinstalling the Windows 2003 server and creating new DC . all network problems were completely solved and Network and internet never disconnected or interrupted again.....

Sure it's very hard to face such problem, since you need to re-infrastrucuture all the network and client computers, as well......

But at least very satisfied, to catch and solve finally the problem......



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