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Why Clients are Losing Network connection intermittently.

We have a Server 2003 network with about 30 client computers.  Intermittently, clients seem to lose connection to network resources intermittently any where fro a few seconds to a mintute or 2.  In the bottom right corner a small computer icon appears.  If they right click it and click "Synchronize Now" then it seems to be ok.  This occurs with a few computers at a time and not always the same clients.  However, all clients have experienced it throughout the week at one time or another.  ANy ideas as to why this is occurring?  
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myrotarycar
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  1. What OS version are clients running?
  2. How are IP addresses assigned? DHCP or statically?
  3. If DHCP, what is acting as DHCP? What's the address scope, ttl, lease length, etc..?
  4. If DHCP is on a Win2K3 domain controller / member, check under event viewer. Anything related to DHCP conflicts?
  5. If DHCP, are you sure you have a single DHCP server running on your physical subnet?
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ASKER

Thank you for responding.  Actually, there are 2 servers running.  There is a main DC and a secondary DC and both are acting as a DHCP
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madunix

You might have duplicate IP's on the network.
Both acting as DHCP servers with different SCOPES, right?
I checked and it appears that both are the same scope.
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myrotarycar
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1. No, I will read on this
2. Yes
3. Yes
4. Will read up
5. YEs, it has the rouet/hardware firewall, switch to plant locations, subnet 255.255.255.0
#2 - Please provide the event logs pertaining to DHCP conflicts.