Exchange Server losing network connection randomly

I have dell hardware with Server 2003 r.2 64bit, and also Exchange 2007 installed. This is acting as my complete exchange server. I have it connected to an HP 1800 Gb switch. The thing keeps losing network connectivity randomly and I can't find anything in the event logs. I have tried using the other NIC in the server and also change the ports on the switch. I don't konw if it is something in the Hub Transport that is causing this or not. Anyone have an idea or some place to start other troubleshooting?
blang2002Asked:
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Greg JacknowCommented:
You can try setting the speed on the NIC and/or the network port manually to 1GB or 100Mb as another troubleshooting step.  Also updatnig the NIC managment app and drivers.  I had a case where drivers caused a loss of conection under load.

Greg J
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adolphus850Commented:
Have you replaced the network cables?

Where are you loosing connections?  Are all clients loosing connections to exchange or is the server definately loosing connection to the rest of the network?  Are there other devices plugged into the switch?  Can they see the exchange server when connection is lost (can run a continuous ping if its intermitent)

Adol
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blang2002Author Commented:
When I do a persistant ping, I get one response and then "request timed out" and it keeps giving me that. I stopped the ping, but had to go to the server room and log into the server. Once I logged in, it came back up. This happens evertime I try to do a ping. I have 2 switches, the servers are all plugged into one and I get the same issue whether it is a device on that switch or the layer three switch which is were all of the workstations are plugged into.
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blang2002Author Commented:
I went back and did another persistant ping, and it will ping continuously from anywhere. This is weird
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adolphus850Commented:
change the network cable with one that you know definately works so we can rule that out.

I assume the server has 2 network cards.  if they are both enabled i would disable the one that's not being used.

Is it possible that a machine or laptop could be being assigned the same ip address as the server?  perhaps a wireless card?  double check that the ip address of the server is excluded from being issued via dhcp.
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blang2002Author Commented:
I swaped cables and it seems to be staying connected, but now no messages are leaving the Exchange server. Everyone can receive, but when they send, the message just sits in the queue. I also noticed that I can ping some of the DNS names of the places being sent to and then some I can not. They may be blocking ping, not sure. But, it's weird that when I cleared the network connectivity problems, the server itself stopped sending messages out of its queue. I tried going through the toolbox stuff, but nothing there helped or said anything was wrong. Don't see anything event viewer either.
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adolphus850Commented:
Sound like a physical network problem to me.  Can you try another cable (a brand new one from a shop would be good).

Also, if you have a spare switch (any speed will do), put the exchange server on that and make sure that it's not connected to the switch that it's currently connected to.  You can do a quick test and can probably do it in lunchtime.  Speed doesn't matter because your looking at connectivity.  What would also be worthwhile is if you could unplug the switch you are currently using for 5 mins out of hours and see what happens when you plug the power back in again.  If it's not the cable i reckon that the switch is on its way out and that should be proved with replacing the switch temporarily.

Adol
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blang2002Author Commented:
Well, the problem is that I'm getting "451 4.4.0 DNS query failed" on all messages trying to leave the exchange. I haven't had any DNS issues before. I don't think a bad cable would give you DNS errors from something as specific as hub transport. When I go to ping all the domains of the emails being sent, the exchange server can resolve all to the proper internet IPs.

Any ideas anyone?
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adolphus850Commented:
didn't you say that the emails STOPPED being sent when you tried another network cable?  So presumably if you put the old network cable back in mail will flow but your server will be intermittent on the network again?
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blang2002Author Commented:
Switching back did nothing for me... I did, however, manually configure the hub transport external dns lookups to my dns server and mail started processing. I am going to go through my logs and see if I can find where this thing is going wrong. Any ideas?
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adolphus850Commented:
Are you now getting another problem than what you first logged?  Getting a bit confused now...
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