Windows Server 2003 loses internet connectivity but not network connectivity

We have a Windows 2003 Server on a network with another Windows 2003 Server.  The one we are having problems with is not running DNS or DHCP for the network.  From time to time, we lose inbound and outbound Internet connectivity - i.e. we can no longer RDP into it from the outside, we can not browse the Internet, and we can not ping either an outside domain name or an outside IP address.

However, we can still RDP to it from the other server, no users complain of any issues with its applications, the Internet is confirmed up (that's how we get into the working server), and the problem server can still talk to all machines on the network.

Any help on where to look would be appreciated.  Thanks in advance.
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Is this one NIC? Have you tried another? If the NIC is not the issue consider the switch/router it connects through and try another properly configured port, switch or router.

Hope this helps...

Darius GhassemCommented:
I would have to say points to a router or telecom issue. I would check to see if you can ping default gateway. If you can then run a tracert to an outside IP address or website see where your hops drop from here you will know where to start from
GlobalConsultingAuthor Commented:
Thanks.  I see I completely neglected to mention this was an intermittent problem, sorry about that.  And I went to run the test you suggested but, of course, it is working fine now.  I will try again the next time this happens - a little later today.

or does the intermittent nature of the issue change anyone's mind?

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Darius GhassemCommented:
Nope actually points to connection problem tracert will help narrow down the problem point
GlobalConsultingAuthor Commented:
Ok, it did fail the traceroute at the router / GW.  But since it is intermittent, any suggestions on what I should look for there?  Thanks again.
GlobalConsultingAuthor Commented:
There are 3 NIC's in the server, two of which are disabled at the moment.

tried TRACERT - it failed at the router.  However, all seems normal with the router.  Suggestions on troubleshooting?
Kudos to dariusq for suggesting tracert.

I would say this looks like a router issue. I would try another port. All of this assumes this has worked fine without issue in the past. If this intermittent issue has always been there I would consider the router's configuration.

Darius GhassemCommented:
I would look into the router having issues or you external connection. I would replace router or have your telecomm company monitor your line
GlobalConsultingAuthor Commented:
This is a new intermittent issue - that server has been in place for a year and the  issue has just cropped up in the last 3 weeks or so.  Next time I'm onsite I'll try a different port and let you know what happens.

Thanks guys
Darius GhassemCommented:
Most likely a router issue or telcomm issue. If you are dropping packets at your core router the router has an issue or going out to the next hop is having an issue with would be telcom
GlobalConsultingAuthor Commented:
The thing is, the other server - which runs on the same router and same Telco line - is not having any issues at all.  i still agree it could be the router and we will have to see if there's a port we can switch to on it - and if the server is even connected straight to the router or through the switch.

We've already swapped out the entire server, so i can't blame a NIC.  We've also replaced the patch cable on the server.  What we haven't done (I don't think, I'll have to check with the tech) is swapped the port the server goes into on the switch and / or router.

Can you tell we're frustrated? ;-)
GlobalConsultingAuthor Commented:
Ok,I've just confirmed that the server in question is patched into the switch not the router.  And we have swapped the switch port, and the patch cable.

However, we did replace the hardware complete (new server completely), but tyhe image on the box is the same.  maybe it is something in the OS somehow?
Darius GhassemCommented:
If you are running a tracert like you said you did. The packets drops after your router has been hit, right?

Please post tracert results
GlobalConsultingAuthor Commented:
That is correct.  We did not record the results but I will post them up the next time the server goes "off line".

Darius GhassemCommented:
So, if the tracert actually touched your router then everything between the server and router should be functioning properly.

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Windows Server 2003

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