Losing connection to server

I have about 10 stations in my building (Building A).  We are connecting through a Cisco switch.
I have one Windows 2003 server in Building A.

We are linked by fiber to another building (Building B).

We use DHCP (from  a server in Building B).
We use DNS with Active Directory.
My default gateway is in Building B.

We are losing connections when a client in A tries to connect to the sever in A.  It is very hard to figure out.  I edited my hosts file to add an entry for the server, so it shouldn't even need to consult DNS. Should I change the default gateway to the server, so everything would be in Building A???

Any help at all.  I know this is vague, but it's killing me.
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dougp23Asked:
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dalsymCommented:
If you are direct linked with fiber into the network structure in B, the gateway shouldn't matter.

When you notice client connection loss, does it apply to all systems in A connecting to B or is it localized to one or two clients?
When the loss occurs, have you run tracert? That could show you where the drop off is occuring



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dougp23Author Commented:
I am direct linked with fiber into B.  (well obviously thru routers, but as direct as you can get!!!)

Applies to all systems in A connecting to B.
If I run tracert, I basically get 1 hop.  (It says from this machine right to server!)

Rebooting clients and server helps for a bit, but it will soon go downhill again....
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dalsymCommented:
Have you considered that it could a hardware problem? Are you using managed routers or switches in A that you could check the event logs on?
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dougp23Author Commented:
well, all the switches and routers are brand new.

i am wondering about default gateways...what if the server and client have DIFFERENT default gateways, even though they are both on the very same network (192.168.1.x).  would that matter???

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